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Income Tax Expense (Tables)
3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of income tax expense from continuing operations at the U.S. federal statutory rate to net income tax expense (benefit) is as follows:
 
 
For the Three Months Ended March 31,
 
 
2018
 
2017
 
 
(in million)
Tax at statutory federal rate (1)
 
$
(10
)
 
$
(1
)
Partnership earnings not subject to tax
 
9

 
(13
)
Statutory tax rate changes
 
29

 

Other
 
3

 

Net income tax expense (benefit)
 
$
31

 
$
(14
)