Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal
Current	$ (116)	$ 6	$ (32)
Deferred	(3)	0	41
Total	(119)	6	9
State and local
Current	4	(1)	(14)
Deferred	3	(23)	2
Total	7	(24)	(12)
Foreign
Current	58	274	483
Deferred	(34)	75	(104)
Total	24	349	379
Total
Current	(54)	279	437
Deferred	(34)	52	(61)
Total income tax expense (benefit)	$ (88)	$ 331	$ 376