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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period $ 2,293 $ 2,731  
Total other comprehensive (loss) (18) (2)  
Balance at end of period 2,394 2,971  
Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (16) (14)  
Other comprehensive loss before reclassifications (23) (1)  
Amounts reclassified from accumulated other comprehensive loss 1 (1)  
Total other comprehensive (loss) (22) (2)  
Balance at end of period (38) (16)  
Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (49) (38)  
Other comprehensive loss before reclassifications 4 0  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Total other comprehensive (loss) 4 0  
Balance at end of period (45) (38)  
Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (2) (2)  
Other comprehensive loss before reclassifications 0 0  
Amounts reclassified from accumulated other comprehensive loss 0 0  
Total other comprehensive (loss) 0 0  
Balance at end of period (2) (2)  
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at beginning of period (67) (54)  
Other comprehensive loss before reclassifications (19) (1)  
Amounts reclassified from accumulated other comprehensive loss 1 (1)  
Total other comprehensive (loss) (18) (2)  
Balance at end of period $ (85) $ (56)  
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     $ 3
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     3
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     (3)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Cumulative-effect adjustment of ASU adoption     $ (3)