Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income	$ 4	$ 0	$ 4	$ 0
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	60	73	81	173
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	3	0	17	1
Income Tax Reconciliation Foreign Income Tax Basis Differential	(4)	(10)	(17)	(31)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(2)	28	0	51
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	2	3	9	6
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	13	0	13	(1)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	0	1	0	6
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(3)	(8)	(4)	(4)
Effective Income Tax Rate Reconciliation, Deduction, Amount	(1)	0	(1)	0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	0	(1)	(1)	0
Income Tax Expense (Benefit)	$ 72	$ 84	$ 101	$ 189
Effective Income Tax Rate Reconciliation, Percent	25.50%	24.30%	26.30%	22.90%