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Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 1,609 $ 1,853 $ 1,718
Other comprehensive income (loss) adjustments before reclassifications 169 (115)  
Amounts reclassified from AOCL 33 19  
Net other comprehensive income (loss) 202 (96) (77)
Ending Balance 1,701 1,609 1,853
Accumulated foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (291) (315)  
Other comprehensive income (loss) adjustments before reclassifications (11) 36  
Amounts reclassified from AOCL 6 (12)  
Net other comprehensive income (loss) (5) 24  
Ending Balance (296) (291) (315)
Accumulated pension liability adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (764) (654)  
Other comprehensive income (loss) adjustments before reclassifications 168 (130)  
Amounts reclassified from AOCL 15 20  
Net other comprehensive income (loss) 183 (110)  
Ending Balance (581) (764) (654)
Changes in fair value of derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (28) (18)  
Other comprehensive income (loss) adjustments before reclassifications 12 (21)  
Amounts reclassified from AOCL 12 11  
Net other comprehensive income (loss) 24 (10)  
Ending Balance (4) (28) (18)
AOCL      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (1,083) (987) (910)
Net other comprehensive income (loss) 202 (96) (77)
Ending Balance $ (881) $ (1,083) $ (987)