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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Tax expense	$ 31		$ 159	$ 63	$ 211
Income before income taxes	121		513	165	809
Other adjustments, charges (benefits)	(6)		31	7	10
Provisional income tax expense (benefit)			11		14
Discrete adjustments, amount			(5)		$ (4)
Tax credit carryforwards, foreign	637			637
Domestic Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	114			114		$ 113
Foreign Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	226			226		$ 204
Tax credit carryforward, valuation allowance	$ 103			$ 103
Luxembourg
Income Tax Contingency [Line Items]
Change in enacted tax rate, amount		$ 6
Japan and Singapore
Income Tax Contingency [Line Items]
Other adjustments, charges (benefits)			$ 25

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