(Summary of Operating Loss And Tax Credit Carryforwards) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	$ 911
Operating Loss Carryforwards, Valuation Allowance	(635)	[1]
Operating Loss and Tax Credit Carryforwards, net	276
2020 Through 2029
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	291
Operating Loss Carryforwards, Valuation Allowance	(198)	[1]
Operating Loss and Tax Credit Carryforwards, net	93
2030 Through 2039
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	78
Operating Loss Carryforwards, Valuation Allowance	(44)	[1]
Operating Loss and Tax Credit Carryforwards, net	34
Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforwards	542
Operating Loss Carryforwards, Valuation Allowance	(393)	[1]
Operating Loss and Tax Credit Carryforwards, net	149
U.S. federal and non-U.S. NOLs
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	527
U.S. federal and non-U.S. NOLs | 2020 Through 2029
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	55
U.S. federal and non-U.S. NOLs | 2030 Through 2039
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	48
U.S. federal and non-U.S. NOLs | Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	424
State taxing jurisdiction NOLs (a)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	94	[1]
Tax credit carryforwards	0	[1]
State taxing jurisdiction NOLs (a) | 2020 Through 2029
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	76	[1]
Tax credit carryforwards	0	[1]
State taxing jurisdiction NOLs (a) | 2030 Through 2039
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	18	[1]
Tax credit carryforwards	0	[1]
State taxing jurisdiction NOLs (a) | Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0	[1]
Tax credit carryforwards	0	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a)
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	290	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a) | 2020 Through 2029
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	160	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a) | 2030 Through 2039
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	12	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a) | Indefinite
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 118	[1]

[1] State amounts are presented net of federal benefit.