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Related Parties - Investments in Unconsolidated Subsidiaries, Equity Securities and Other (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Mar. 22, 2019
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 918 $ 1,053  
Difference between equity method investment carrying value and book value 762 901  
Dividends from unconsolidated subsidiaries $ 53 100  
IPM India [Member]      
Schedule of Equity Method Investments [Line Items]      
Parent ownership percentage 56.30%    
EITA [Member] | STAEM [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 51.00%    
Management Et Developpement Des Actifs Et Des Ressources Holding (MADAR Holding) [Member] | STAEM [Member]      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 49.00%    
TTI [Member] | PMM [Member]      
Schedule of Equity Method Investments [Line Items]      
Noncontrolling ownership percentage 33.00%    
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 and equity securities $ 733 $ 863  
Megapolis Group      
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