Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 41	$ 55	$ 21	$ 100
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	8	1	13	1
Income Tax Reconciliation Foreign Income Tax Basis Differential	(17)	(6)	(13)	(21)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	8	5	3	23
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	1	2	7	3
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	0	0	0	(2)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	(1)	4	0	5
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(2)	3	(1)	4
Effective Income Tax Rate Reconciliation, Deduction, Amount	(4)	1	(1)	1
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	1	1	0	1
Income Tax Expense (Benefit)	$ 37	$ 58	$ 29	$ 105
Effective Income Tax Rate Reconciliation, Percent	18.90%	22.10%	28.60%	21.90%