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Restructuring (Tables)
12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Activity The following table summarizes restructuring reserve activity during 2018 (in millions):

 
Employee Severance and Benefits
Accrued liability as of January 1, 2018
$

Charges
86

Payments
(61
)
Other
(17
)
Accrued liability as of December 31, 2018
$
8