Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Tax expense	$ 6	$ 33
Income before income taxes	(38)	113
Other adjustments, amount	7	$ 7
Tax credit carryforwards, foreign	637
Domestic Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	113		$ 113
Foreign Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	222		$ 204
Tax credit carryforward, valuation allowance	$ 103