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Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Cumulative effect of change in accounting policy       $ 50 $ 144
Distributions of earnings of unconsolidated affiliates $ (69) $ (75) $ (62)    
Investments 146 344 0    
Equity in and advances to unconsolidated affiliates 850 724     452
Accounting Standards Update 2014-09          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Cumulative effect of change in accounting policy       29  
Equity in and advances to unconsolidated affiliates         87
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Equity in and advances to unconsolidated affiliates   8     87
Equity Method Investments          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Beginning balance 724 365      
Cumulative effect of change in accounting policy       29 87
Adjusted balance at January 1,   753 452    
Equity in earnings of unconsolidated affiliates 35 79      
Distributions of earnings of unconsolidated affiliates (69) (75)      
Payments from (advances to) unconsolidated affiliates, net (10) (12)      
Investments 146 344      
Foreign currency translation adjustments (7) (28)      
Other 2 (36)      
Ending balance 850 724 $ 365    
Equity in and advances to unconsolidated affiliates   724   753  
Amount allocated to fund ownership venture $ 141 $ 344      
Equity Method Investments | Accounting Standards Update 2014-09          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Equity in and advances to unconsolidated affiliates       $ 29  
Aspire | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09          
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]          
Equity in and advances to unconsolidated affiliates         $ 87