Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Tax expense	$ 26		$ 19		$ 32	$ 52
Income before income taxes	82		183		44	296
Other adjustments, charges (benefits)	6	$ 7	(28)	$ 7	13	$ (21)
Provisional income tax expense (benefit)			(4)
Tax credit carryforwards, foreign	637				637
Domestic Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	113				113		$ 113
Foreign Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	233				233		$ 204
Tax credit carryforward, valuation allowance	103				$ 103
Luxembourg
Income Tax Contingency [Line Items]
Change in enacted tax rate, amount	$ 6
Japan and Singapore [Member]
Income Tax Contingency [Line Items]
Other adjustments, charges (benefits)			$ (25)