Go to the “2023 First Quarter Report” https://berkshirehathaway.com/qtrly/1stqtr23.pdf . You can also go there via

https://www.berkshirehathaway.com/ -> Annual & Interim Reports
-> link corresponding to (row = Year 2023, column = 1st Quarter)
-> Click on "2023 First Quarter Report (PDF file)"

In the quarter report, go to pg-28 (Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations) → Results of Operations which has the below table

                                                                    First Quarter
                                                                 2023        2022
Insurance – underwriting                                        $    911    $   167
Insurance – investment income                                      1,969      1,170
BNSF                                                               1,247      1,371
Berkshire Hathaway Energy (“BHE”)                                    416        775
Pilot Travel Centers (“Pilot”)                                        83         -- 
Manufacturing, service and retailing                               2,982      3,025
Non-controlled businesses*                                           568        282 
Investment and derivative contract gains (losses)                 27,439     (1,580)
Other                                                               (111)       370 
Net earnings attributable to Berkshire Hathaway shareholders    $ 35,504    $ 5,580
------------
*  Includes certain businesses in which Berkshire had between a 20% and 50% ownership interest. 

To get the operating earnings, subtract “Investment and derivative contract gains (losses)” from “Net earnings attributable to Berkshire Hathaway shareholders”

So, the operating earnings in Q1 of 2023 are

>>> 35504 - 27439
8065

and the operating earnings in Q1 of 2022 are

>>> 5580 + 1580
7160

So, the operating earnings increased by 12.6%

>>> round( ((8065 / 7160) - 1)*100, 1)
12.6

Notes:

• The 12.6% and $8,065 million match with the numbers mentioned in the last paragraph of https://www.barrons.com/livecoverage/berkshire-hathaway-warren-buffett-annual-shareholder-meeting

  Berkshire’s first-quarter results were released earlier on Saturday morning,
  showing a 12.6% rise in operating profit, to $8.1 billion.

• https://www.businesswire.com/news/home/20230506005003/en/ shows that the operating earnings are \$8,065 million and \$7,160 million in Q1 or 2023 and 2022 respectively. This matches with the above calculation.
  • This press release is a bit easier to understand about operating earnings compared to my approach. But I do not know how to generalize it for other quarters (ex:- how to get the corresponding businesswire link?).
  • I found businesswire link in https://www.barrons.com/articles/berkshire-hathaway-inc-first-quarter-2023-earnings-release-e6e998bf
• The operating income can get revised at a later point in time. For example, https://www.businesswire.com/news/home/20220430005003/en shows that the original operating income was \$7,040 million. But https://www.businesswire.com/news/home/20230506005003/en shows that it got revised to \$7,160 million.

Go to the annual report https://www.berkshirehathaway.com/2022ar/2022ar.pdf . You can also go there via

https://www.berkshirehathaway.com/ -> Annual & Interim Reports
-> Year link corresponding to (row, column) = (2022; Annual)
-> Click on "2022 Annual Report (PDF file)" .

In the annual report, go to pg-86 (K-70)

                  (dollars in millions)
                                                   2022
Insurance and Other:
  Cash and cash equivalents                        $32,260
  Short-term investments in U.S. Treasury Bills    $92,774
Railroad, Utilities and Energy:
  Cash and cash equivalents                        $ 3,551

Summing up all these numbers gives \$128,585. So Berkshire has about \$129 billion in cash.

See also:

• https://github.com/KamarajuKusumanchi/market_data/blob/master/berkshire/cash.txt - Berkshire's cash by quarter.