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Changes in Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated other comprehensive income (loss)
  
Post-Retirement Benefits, Net of Tax
 
Translation Adjustments and Other, Net of Tax
 
Total
 
(in millions)
Balance, December 31, 2018
$
(47
)
 
$
(38
)
 
$
(85
)
Other comprehensive income (loss) before reclassifications, net of tax
—

 
(1
)
 
(1
)
Reclassifications from accumulated other comprehensive loss to earnings
1

 
—

 
1

Other comprehensive income (loss), net of tax
1

 
(1
)
 
—

Elimination of stranded tax effects resulting from tax legislation
(6
)
 
—

 
(6
)
Balance, March 31, 2019
$
(52
)
 
$
(39
)
 
$
(91
)