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Related Parties - Investments in Unconsolidated Subsidiaries, Equity Securities and Other (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mar. 22, 2019
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated subsidiaries $ 1,053 $ 981  
Difference between equity method investment carrying value and book value 901 835  
Dividends from unconsolidated subsidiaries $ 100 118  
PMM [Member] | TTI [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 33.00%    
STAEM [Member] | EITA [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 51.00%    
STAEM [Member] | Management Et Developpement Des Actifs Et Des Ressources Holding (MADAR Holding) [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 49.00%    
Godfrey Phillips India Ltd [Member] | IPM India [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 43.70%    
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Difference between equity method investment carrying value and book value, amortization period 10 years    
Maximum [Member]      
Schedule of Equity Method Investments [Line Items]      
Difference between equity method investment carrying value and book value, amortization period 20 years    
Equity Method Investment Goodwill [Member]      
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated subsidiaries $ 863 $ 793  
Megapolis [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 23.00%    
EITA [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 49.00%    
STAEM [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 25.00%    
RBH [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity securities     $ 3,280