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Income Taxes - Differences Between Statutory Income Tax Rate and Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Increase (decrease) resulting from:
Tax at statutory rate	$ 296	$ 219	$ 449	$ 500
Tax-exempt income from municipal bonds	(6)	(5)	(17)	(16)
Dividend received exclusion	(5)	(6)	(16)	(16)
Other	6	12	7	24
Total provision for income taxes	$ 291	$ 220	$ 423	$ 492
Increase (decrease) resulting from:
Tax at statutory rate	21.00%	21.00%	21.00%	21.00%
Tax-exempt income from municipal bonds, Percent	(0.40%)	(0.50%)	(0.80%)	(0.70%)
Dividend received exclusion, Percent	(0.40%)	(0.60%)	(0.70%)	(0.70%)
Other	0.40%	1.30%	0.30%	1.10%
Provision for income taxes	20.60%	21.20%	19.80%	20.70%

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