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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss $ (987) $ (910) $ (922)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 1,718 1,197 725
Other comprehensive income adjustments before reclassifications (93) (27)  
Amounts reclassified from AOCL 16 39  
Total other comprehensive income (loss) (77) 12 127
Ending Balance 1,857 1,718 1,197
Accumulated foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (315) (304) (259)
Accumulated other comprehensive loss, tax (3) (2) (4)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (304) (259)  
Other comprehensive income adjustments before reclassifications (3) (51)  
Amounts reclassified from AOCL (8) 6  
Total other comprehensive income (loss) (11) (45)  
Ending Balance (315) (304) (259)
Accumulated pension liability adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (654) (592) (660)
Accumulated other comprehensive loss, tax (224) (213) (227)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (592) (660)  
Other comprehensive income adjustments before reclassifications (76) 44  
Amounts reclassified from AOCL 14 24  
Total other comprehensive income (loss) (62) 68  
Ending Balance (654) (592) (660)
Changes in fair value for derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (18)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Other comprehensive income adjustments before reclassifications (14)    
Amounts reclassified from AOCL 10    
Total other comprehensive income (loss) (4)    
Ending Balance (18)    
Changes in fair value of derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss   (14) (3)
Accumulated other comprehensive loss, tax (5) (3) 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (14) (3)  
Other comprehensive income adjustments before reclassifications   (20)  
Amounts reclassified from AOCL   9  
Total other comprehensive income (loss)   (11)  
Ending Balance   (14) (3)
AOCL      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (910) (922) (1,049)
Total other comprehensive income (loss) (77) 12 127
Ending Balance $ (987) $ (910) $ (922)