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Changes in Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2017
$
(564
)
 
$
(23
)
 
$
(824
)
 
$
(1,411
)
Other comprehensive income (loss) before reclassifications, net of tax
2

 
(1
)
 
(75
)
 
(74
)
Reclassifications from accumulated other comprehensive loss to earnings
15

 
(1
)
 
—

 
14

Other comprehensive income (loss), net of tax
17

 
(2
)
 
(75
)
 
(60
)
Balance, June 30, 2018
$
(547
)
 
$
(25
)
 
$
(899
)
 
$
(1,471
)