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Income Taxes - Differences Between Statutory Income Tax Rate and Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Increase (decrease) resulting from:
Tax at statutory rate	$ (27)	$ 200
Tax-exempt income from municipal bonds	(5)	(5)
Dividend received exclusion	(5)	(5)
Other	(1)	8
Total provision (benefit) for income taxes	$ (38)	$ 198
Increase (decrease) resulting from:
Tax at statutory rate	21.00%	21.00%
Tax-exempt income from municipal bonds, Percent	3.90%	(0.50%)
Dividend received exclusion, Percent	3.90%	(0.50%)
Other	0.90%	0.80%
Provision for income taxes	29.70%	20.80%

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