Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Current income tax expense included in consolidated statement of income, federal	$ 636	$ 659	$ 532
Current income tax expense included in consolidated statement of income, foreign	97	67	35
Current income tax expense included in consolidated statement of income, state	8	6	4
Total current tax expense	741	732	571
Deferred income tax expense (benefit) included in consolidated statement of income, federal	(186)	62	(29)
Deferred income tax expense (benefit) included in consolidated statement of income, foreign	(43)	2	(2)
Total deferred tax expense (benefit)	(229)	64	(31)
Total income tax expense included in the consolidated statement of income	512	796	540
Expense (benefit) relating to changes in the unrealized gain (loss) on investments, unrealized loss on foreign exchange and other items in other comprehensive income (loss)	(2,002)	(362)	490
Total income tax expense (benefit) included in the consolidated financial statements	$ (1,490)	$ 434	$ 1,030