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Restructuring Plans (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring Plans  
Summary of restructuring activity

(in millions)

    

Accrued balance at December 31, 2017

$

119

Restructuring charges

28

Payments and other adjustments

(77)

Accrued balance at December 31, 2018

70

Restructuring charges

66

Payments and other adjustments

(57)

Accrued balance at December 31, 2019

79

Restructuring charges

36

Payments and other adjustments

(45)

Accrued balance at December 31, 2020

$

70