Income Taxes (Components of Income Tax Expense (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal
Current	$ 354	$ 739	$ 9
Deferred	177	257	(1,960)
Foreign
Current	204	326	126
Deferred	(50)	53	3
State and local
Current	61	255	61
Deferred	55	(58)	68
Income tax expense	$ 801	$ 1,572	$ (1,693)