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Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Equity $ (13,399) $ (13,826) $ (14,316) $ (13,826) $ (14,316) $ (13,519) $ (14,416) $ (13,699) $ (13,266) $ (13,268)
Allowance for Loan and Lease Losses, Adjustments, Other   $ 0 (1) $ (1) 0          
Phase-in of capital impact of Accounting Standards Update 2016-13   25.00%   25.00%            
CECL scaling factor   25.00%   25.00%            
Accounting Standards Update 2016-13                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Equity 1,017                  
Allowance for Loan and Lease Losses, Adjustments, Other 1,300                  
Phase-in of capital impact of Accounting Standards Update 2016-13   25.00%   25.00%            
CECL scaling factor   25.00%   25.00%            
Accumulated Deficit                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Equity 5,074 $ 5,296 $ 4,682 $ 5,296 $ 4,682 $ 5,465 $ 4,057 $ 5,195 $ 5,499 $ 5,489
Accumulated Deficit | Accounting Standards Update 2016-13                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Equity $ 1,017