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Changes in Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated other comprehensive income (loss)
  
Post-Retirement Benefits, Net of Tax
 
Hedge Instruments, Net of Tax
 
Translation Adjustments and Other, Net of Tax
 
Total
 
(in millions)
Balance, December 31, 2016
$
(614
)
 
$
(22
)
 
$
(948
)
 
$
(1,584
)
Other comprehensive income before reclassifications, net of tax
—

 
1

 
108

 
109

Reclassifications from accumulated other comprehensive loss to earnings
17

 
(2
)
 
(1
)
 
14

Other comprehensive income (loss), net of tax
17

 
(1
)
 
107

 
123

Balance, September 30, 2017
$
(597
)
 
$
(23
)
 
$
(841
)
 
$
(1,461
)