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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 24
Income tax expense	$ 66	$ 31	$ 208	$ 88
Effective tax rate	23.00%	9.00%	20.00%	10.00%
Income Tax Expense (Benefit) associated with discrete items	$ 28	$ (11)	$ 48	$ (23)
Cash taxes paid			205	$ 171
UNITED STATES
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 25		$ 50

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The total income tax expense (benefit) associated with unusual or infrequent items incurred during the interim period.

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