Federal Income Taxes - Reconciliation of the Effective Tax Rate Differences (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income (loss) before taxes	$ (1,148)	$ 1,725	$ 4,643
Federal statutory rate	21.00%	21.00%	21.00%
Federal income tax expense (benefit) at federal statutory rate	$ (241)	$ 362	$ 975
Effect of:
Tax-preferred investment income	(126)	(90)	(88)
Tax credits	(40)	(42)	(26)
Excess tax expense (benefit) from stock-based compensation	4	(1)	0
Goodwill impairment	0	133	0
Other items	7	5	4
Federal income tax expense (benefit)	$ (396)	$ 367	$ 865
Effective tax rate	34.00%	21.00%	19.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible impairment loss.

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