Subject: Re: Rest is noise
One thing I noticed, in this 1st Q report they list 4th Q 2022 shareholder equity as $473,424. That's a little different than was listed in the annual report, $472,360. So I guess a little adjustment? Is that common? I'm new to reading these reports.

It's not terribly common, no. You'd expect that the 12/31/2022 balances originally reported in the year-end 2022 10-K would be the same 12/31/2022 balances reported (for comparison purposes) in the 3/31/2023 10-Q.

In this case, the Statement of Shareholders' Equity would point you in the right direction. What you see there for the various Equity accounts are the following line items:
Balance at December 31, 2022 as previously reported
Adoption of ASU 2018-12
Balance at December 31, 2022 as revised

The item in bold is the key - they adopted a new accounting pronouncement in the first quarter of 2023, which caused them to remeasure certain liabilities on a retroactive basis.

If you go to the footnotes, you'll see a fuller description in Note 2:
We adopted Accounting Standards Update 2018-12 'Targeted Improvements to the Accounting for Long Duration Contracts' ('ASU 2018-12') as of January 1, 2023, which modifies the accounting, reporting and disclosures related to long duration insurance contracts and most significantly the measurement of our long duration life, annuity and health benefit liabilities. ASU 2018-12 was applied retrospectively to contracts in-force beginning as of January 1, 2021 (the 'transition date'). The Consolidated Financial Statements for 2022 and 2021 were revised to reflect the effects of the adoption of ASU 2018-12. As of the transition date, the after-tax impact of changes in cash flow assumptions were recorded in retained earnings and the after-tax effect of changes in discount rates assumptions were recorded in accumulated other comprehensive income. The effects of the adoption of ASU 2018-12 on our Consolidated Financial Statements as of January 1, 2021 and for the years ending December 31, 2022 and 2021 are included in Part II, Item 5 of this Report.