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Accumulated Other Comprehensive Loss (Reclassification out of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit $ (40) $ (6) $ (56) $ (5)
Foreign currency hedge and interest rate swap settlements 2 (2) (1) 5
Net loss $ (149) $ (39) (101) (123)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated foreign currency translation adjustments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification of foreign currency adjustments     (3) 11
Tax benefit     0 0
Net loss     (3) 11
Reclassification out of Accumulated Other Comprehensive Income | Accumulated pension liability adjustments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit     3 2
Amortization of actuarial loss     (16) (12)
Net loss     (13) (10)
Reclassification out of Accumulated Other Comprehensive Income | Changes in fair value of derivatives        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Tax benefit     2 1
Foreign currency hedge and interest rate swap settlements     (8) (6)
Net loss     $ (6) $ (5)