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Other Liabilities - Restructuring Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]      
Beginning balance $ 103 $ 71 $ 60
Restructuring charges 49 109 61
Reserves utilized: cash (72) (56) (38)
Reserves utilized: non-cash (9) (20) (8)
Currency translation adjustments 5 (1) (4)
Ending balance 76 103 71
Severance and Other Employee Costs      
Restructuring Reserve [Roll Forward]      
Beginning balance 62 40 48
Restructuring charges 46 98 39
Reserves utilized: cash (61) (77) (36)
Reserves utilized: non-cash (6) 3 (9)
Currency translation adjustments 3 (2) (2)
Ending balance 44 62 40
Facility Related Costs      
Restructuring Reserve [Roll Forward]      
Beginning balance 38 30 12
Restructuring charges 3 (2) 17
Reserves utilized: cash (7) 25 0
Reserves utilized: non-cash (5) (16) 1
Currency translation adjustments 1 1 0
Ending balance 30 38 30
Other Restructuring      
Restructuring Reserve [Roll Forward]      
Beginning balance 3 1 0
Restructuring charges 0 13 5
Reserves utilized: cash (4) (4) (2)
Reserves utilized: non-cash 2 (7) 0
Currency translation adjustments 1 0 (2)
Ending balance $ 2 $ 3 $ 1