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Changes in Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 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 (loss) income before reclassifications, net of tax
—

 
(1
)
 
33

 
32

Reclassifications from accumulated other comprehensive loss to earnings
11

 
—

 
—

 
11

Other comprehensive income, net of tax
11

 
(1
)
 
33

 
43

Balance, March 31, 2018
$
(553
)
 
$
(24
)
 
$
(791
)
 
$
(1,368
)