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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Tax provision at U.S. federal statutory rate	$ 122	$ 111	$ 419	$ 308
Tax-exempt interest	(10)	(12)	(31)	(36)
Increase in deferred tax valuation allowance	1	(6)	(6)	(19)
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount	0	8	5	8
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	(5)	(6)	(16)	(3)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount	0	(5)	0	(5)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(8)	(4)	(9)	(4)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	1	(6)	(6)	(6)
Other	(2)	3	(2)	(3)
Income tax expense	$ 101	$ 73	$ 360	$ 268

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