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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax provision at U.S. federal statutory rate [1]	$ 368	$ 253	$ 157
Tax-exempt interest	(66)	(123)	(124)
Decrease in deferred tax valuation allowance	0	0	(79)
Executive Compensation	11	0	0
Stock-based compensation	(5)	(15)	0
Solar credits	0	0	(79)
Sale of the U.K. property & casualty run-off subsidiaries and foreign rate differential	0	5	(37)
Tax Reform	(39)	877	0
Other	(1)	(12)	(4)
Total income tax expense (benefit)	$ 268	$ 985	$ (166)

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amount

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