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Summary of Significant Accounting Policies - New Accounting Standards (Details) - USD ($)
$ in Millions
Jan. 01, 2020
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease liabilities     $ 783      
Operating lease ROU assets [1]     719      
Cumulative decrease in allowance for credit losses on loans     $ (637) $ (541) $ (681) $ (1,017)
Accounting Standards Update 2016-02 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease liabilities   $ 780        
Operating lease ROU assets   780        
Cumulative effect of new accounting principle in period of adoption   $ 27        
Subsequent Event [Member] | Accounting Standards Update 2016-13 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle in period of adoption $ 82          
Cumulative decrease in allowance for credit losses on loans 167          
Cumulative increase in liability for off-balance sheet credit exposures 54          
Subsequent Event [Member] | Student Loan [Member] | Accounting Standards Update 2016-13 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle in period of adoption 2          
Subsequent Event [Member] | Commercial Loan [Member] | Accounting Standards Update 2016-13 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative decrease in allowance for credit losses on loans 124          
Subsequent Event [Member] | Consumer Loans [Member] | Accounting Standards Update 2016-13 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative decrease in allowance for credit losses on loans $ 43          
[1] Reported net of level lease adjustments, exit cost obligations and accumulated impairment losses.