Income Tax (Provision for Income Tax Expense Computed from Statutory Rate to Pre-tax Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	$ (1)	$ (8)	$ (6)
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	116	238	178
Tax Adjustments, Settlements, and Unusual Provisions	0	0	(62)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	21	2	4
Income Tax Reconciliation Foreign Income Tax Basis Differential	(32)	(23)	(23)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	10	56	23
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	10	8	1
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	13	(1)	1
Gilti Net of Credits	13	0	10
Income Tax Reconciliation Subpart F	0	1	1
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(7)	(6)	(3)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(4)	(6)	(1)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(1)	1	7
Income Tax Expense (Benefit)	$ 138	$ 262	$ 130
Effective Income Tax Rate Reconciliation, Percent	24.90%	23.10%	15.40%