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Restructuring (Tables)
12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Schedule of restructuring activity

The following table summarizes restructuring reserve activity during 2019 (in millions):

 
Employee Severance and Benefits
Accrued liability as of January 1, 2019
$
8

Charges
77

Payments
(49
)
Accrued liability as of December 31, 2019
$
36