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Investment Securities (Available For Sale and Held to Maturity Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Available for sale securities:    
Less than 12 months Fair Value $ 45,958 $ 17,493
Less than 12 months Unrealized Losses 350 100
12 months or longer Fair Value 9,845 8,133
12 months or longer Unrealized Losses 107 40
Total Fair Value 55,803 25,626
Total Unrealized Losses 457 140
Held to maturity securities:    
Less than 12 months Fair Value   23,690
Less than 12 months Unrealized Losses   163
12 months or longer Fair Value   21,808
12 months or longer Unrealized Losses   202
Total Fair Value   45,498
Total Unrealized Losses   365
Total securities with unrealized losses    
Less than 12 months Fair Value   41,183
Less than 12 months Unrealized Losses   263
12 months or longer Fair Value   29,941
12 months or longer Unrealized Losses   242
Total Fair Value   71,124
Total Unrealized Losses   505
Asset-backed securities [Member]    
Available for sale securities:    
Less than 12 months Fair Value 4,053 960
Less than 12 months Unrealized Losses 83 6
12 months or longer Fair Value 3,993 298
12 months or longer Unrealized Losses 93 7
Total Fair Value 8,046 1,258
Total Unrealized Losses 176 13
Held to maturity securities:    
Less than 12 months Fair Value   7,507
Less than 12 months Unrealized Losses   63
12 months or longer Fair Value   2,898
12 months or longer Unrealized Losses   22
Total Fair Value   10,405
Total Unrealized Losses   85
U.S. agency mortgage-backed securities [Member]    
Available for sale securities:    
Less than 12 months Fair Value 41,247 16,023
Less than 12 months Unrealized Losses 266 94
12 months or longer Fair Value 5,852 6,592
12 months or longer Unrealized Losses 14 27
Total Fair Value 47,099 22,615
Total Unrealized Losses 280 121
Held to maturity securities:    
Less than 12 months Fair Value   16,183
Less than 12 months Unrealized Losses   100
12 months or longer Fair Value   18,910
12 months or longer Unrealized Losses   180
Total Fair Value   35,093
Total Unrealized Losses   280
Foreign government agency securities [Member]    
Available for sale securities:    
Less than 12 months Fair Value 658  
Less than 12 months Unrealized Losses 1  
12 months or longer Fair Value 0  
12 months or longer Unrealized Losses 0  
Total Fair Value 658  
Total Unrealized Losses $ 1  
U.S. Treasury securities [Member]    
Available for sale securities:    
Less than 12 months Fair Value   510
Less than 12 months Unrealized Losses   0
12 months or longer Fair Value   1,243
12 months or longer Unrealized Losses   6
Total Fair Value   1,753
Total Unrealized Losses   $ 6