(Summary of Operating Loss And Tax Credit Carryforwards) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Total	$ 885
Less: valuation allowance (a)	(604)	[1]
Total, net	281
2021 Through 2030
Operating Loss Carryforwards [Line Items]
Total	232
Less: valuation allowance (a)	(145)	[1]
Total, net	87
2031 Through 2040
Operating Loss Carryforwards [Line Items]
Total	77
Less: valuation allowance (a)	(49)	[1]
Total, net	28
Indefinite
Operating Loss Carryforwards [Line Items]
Total	576
Less: valuation allowance (a)	(410)	[1]
Total, net	166
U.S. federal and non-U.S. NOLs
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	512
U.S. federal and non-U.S. NOLs | 2021 Through 2030
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	2
U.S. federal and non-U.S. NOLs | 2031 Through 2040
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	53
U.S. federal and non-U.S. NOLs | Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	457
State taxing jurisdiction NOLs (a)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	77	[1]
State taxing jurisdiction NOLs (a) | 2021 Through 2030
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	61	[1]
State taxing jurisdiction NOLs (a) | 2031 Through 2040
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	16	[1]
State taxing jurisdiction NOLs (a) | Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a)
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	296	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a) | 2021 Through 2030
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	169	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a) | 2031 Through 2040
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	8	[1]
U.S. federal, non- U.S. and state tax credit carryforwards (a) | Indefinite
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 119	[1]

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