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Investments in Unconsolidated Subsidiaries and Affiliates - Summary of Combined Results of Operations and Financial Position Reported By Investees Accounted Using Equity Method (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]        
Net revenue $ 24,285 $ 26,149 $ 27,831  
Net income (loss) (438) 1,454 1,099  
Statement of Financial Position [Abstract]        
Total Assets 48,719 47,352    
Total Liabilities 43,690 41,196    
Total Equity 4,989 6,121 5,068 $ 4,232
Unconsolidated Subsidiaries and Affiliates        
Income Statement [Abstract]        
Net revenue 2,716 2,480 2,875  
Income before taxes 133 71 150  
Net income (loss) 50 29 $ 109  
Statement of Financial Position [Abstract]        
Total Assets 8,529 7,709    
Total Liabilities 7,449 6,611    
Total Equity $ 1,080 $ 1,098