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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Tax provision at U.S. federal statutory rate	$ 233	$ 125	$ 297	$ 197
Tax-exempt interest	(10)	(12)	(21)	(24)
Increase in deferred tax valuation allowance	(6)	(7)	(7)	(13)
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount	(5)	0	(5)	0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	(7)	0	(7)	0
Other	12	(4)	12	(9)
Income tax expense	$ 205	$ 124	$ 259	$ 195

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

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