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Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Equity $ (14,126) $ (13,826) $ (14,416) $ (14,450) $ (14,316) $ (13,268)
Allowance for loan losses $ 3,379 3,354 1,263 1,277 1,282 1,242
Phase-in of capital impact of Accounting Standards Update 2016-13 25.00%          
CECL scaling factor 25.00%          
Accumulated Deficit            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Equity $ 4,893 $ 5,296 4,057 $ 4,368 $ 4,682 $ 5,489
Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Phase-in of capital impact of Accounting Standards Update 2016-13 25.00%          
CECL scaling factor 25.00%          
Accounting Standards Update 2016-13 | Revision of Prior Period, Accounting Standards Update, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Equity     1,017      
Accounting Standards Update 2016-13 | Revision of Prior Period, Accounting Standards Update, Adjustment | Accumulated Deficit            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Equity     1,017      
Allowance for loan losses     $ 1,346