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Income Tax Expense (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax at statutory federal rate (1)	[1]	$ (10)	$ (1)
Partnership earnings not subject to tax		9	(13)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		29	0
Other		3	0
Net income tax expense (benefit)		$ 31	$ (14)
[1] In December 2017, the “Tax Cuts and Jobs Act” was signed into law. Among other provisions, the highest corporate federal income tax rate was reduced from 35% to 21% for tax years beginning after December 31, 2017.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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