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Restructuring (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring accrual        
Beginning balance, restructuring reserve $ 43 $ 34 $ 45 $ 45
Charges 8 67 8 67
Write-down of assets to net realizable value   (40)   (40)
Net cash paid, principally severance and related benefits (7) (14) (10) (22)
Other, including foreign exchange translation     1 (3)
Ending balance, restructuring reserve 44 47 44 47
Restructuring, Additional Information        
Carrying value of impaired assets   1   1
Employee Costs        
Restructuring accrual        
Beginning balance, restructuring reserve 35 22 38 32
Charges 2 21 2 21
Net cash paid, principally severance and related benefits (5) (13) (8) (21)
Other, including foreign exchange translation       (2)
Ending balance, restructuring reserve 32 30 32 30
Asset Impairment        
Restructuring accrual        
Charges   40   40
Write-down of assets to net realizable value   (40)   (40)
Other Exit Costs        
Restructuring accrual        
Beginning balance, restructuring reserve 8 12 7 13
Charges 6 6 6 6
Net cash paid, principally severance and related benefits (2) (1) (2) (1)
Other, including foreign exchange translation     1 (1)
Ending balance, restructuring reserve $ 12 $ 17 $ 12 $ 17