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Accumulated Other Comprehensive Loss (Changes by Component) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 1,675 $ 1,654 $ 1,609 $ 1,853
Other comprehensive income adjustments before reclassifications     16 (60)
Amounts reclassified from AOCL     22 4
Other comprehensive income (loss), net of tax 9 38 38 (56)
Ending balance 1,501 1,642 1,501 1,642
Accumulated foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (291) (315)
Other comprehensive income adjustments before reclassifications     8 (37)
Amounts reclassified from AOCL     3 (11)
Other comprehensive income (loss), net of tax     11 (48)
Ending balance (280) (363) (280) (363)
Accumulated pension liability adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (764) (654)
Other comprehensive income adjustments before reclassifications     0 0
Amounts reclassified from AOCL     13 10
Other comprehensive income (loss), net of tax     13 10
Ending balance (751) (644) (751) (644)
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 adjustments before reclassifications     8 (23)
Amounts reclassified from AOCL     6 5
Other comprehensive income (loss), net of tax     14 (18)
Ending balance (14) (36) (14) (36)
AOCL        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (1,054) (1,081) (1,083) (987)
Other comprehensive income (loss), net of tax 9 38 38 (56)
Ending balance $ (1,045) $ (1,043) $ (1,045) $ (1,043)