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Income Tax Expense (Tables)
6 Months Ended
Jun. 30, 2017
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 is as follows:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(in million)
Tax at statutory federal rate
$
(8
)
 
$
21

 
$
(8
)
 
$
45

Partnership earnings not subject to tax
(43
)
 
(26
)
 
(56
)
 
(61
)
State and local tax, net of federal benefit
(4
)
 

 
(4
)
 

Statutory tax rate changes

 
1

 

 
12

Other
(2
)
 
7

 
(2
)
 
9

Net income tax expense (benefit)
$
(57
)
 
$
3

 
$
(70
)
 
$
5