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Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in One Year or Less, Amount $ 354  
Due in One Year or Less, Yield 3.96%  
Due after One Year through Five Years, Amount $ 50  
Due after One Year through Five Years, Yield 3.80%  
Due after Five Years through Ten Years, Amount $ 1,112  
Due after Five Years though Ten Years, Yield 2.53%  
Due after Ten Years, Amount $ 188,736  
Due after Ten Years, Yield 3.24%  
Amortized Cost $ 190,252 $ 203,652
Total, Yield 3.24%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Debt securities carried at fair value $ 254,342 238,101
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less, Amount 354  
Due after One Year through Five Years, Amount 50  
Due after Five Years though Ten Years, Amount 1,139  
Due after Ten Years, Amount 192,731  
Debt Securities, Held-to-maturity, Fair Value 194,274 $ 200,435
Mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due in One Year or Less, Yield 0.00%  
Due after One Year through Five Years, Amount $ 3,446  
Due after One Year through Five Years, Yield 2.28%  
Due after Five Years though Ten Years, Amount $ 11,854  
Due after Five Years though Ten Years, Yield 2.57%  
Due after Ten Years, Amount $ 140,960  
Due after Ten Years, Yield 3.44%  
Total, Amount $ 156,260  
Total, Yield 3.35%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due after One Year through Five Years, Amount 3,484  
Due after Five Years though Ten Years, Amount 12,168  
Due after Ten Years, Amount 142,435  
Debt securities carried at fair value 158,087  
Agency    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due in One Year or Less, Yield 0.00%  
Due after One Year through Five Years, Amount $ 120  
Due after One Year through Five Years, Yield 2.37%  
Due after Five Years though Ten Years, Amount $ 1,715  
Due after Five Years though Ten Years, Yield 2.42%  
Due after Ten Years, Amount $ 132,139  
Due after Ten Years, Yield 3.29%  
Total, Amount $ 133,974  
Total, Yield 3.28%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due after One Year through Five Years, Amount 120  
Due after Five Years though Ten Years, Amount 1,719  
Due after Ten Years, Amount 133,111  
Debt securities carried at fair value 134,950  
Agency-collateralized mortgage obligations    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due in One Year or Less, Yield 0.00%  
Due after One Year through Five Years, Amount $ 0  
Due after One Year through Five Years, Yield 0.00%  
Due after Five Years though Ten Years, Amount $ 27  
Due after Five Years though Ten Years, Yield 2.56%  
Due after Ten Years, Amount $ 4,850  
Due after Ten Years, Yield 3.17%  
Total, Amount $ 4,877  
Total, Yield 3.17%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due after One Year through Five Years, Amount 0  
Due after Five Years though Ten Years, Amount 28  
Due after Ten Years, Amount 4,934  
Debt securities carried at fair value 4,962  
Commercial    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due in One Year or Less, Yield 0.00%  
Due after One Year through Five Years, Amount $ 3,326  
Due after One Year through Five Years, Yield 2.28%  
Due after Five Years though Ten Years, Amount $ 10,100  
Due after Five Years though Ten Years, Yield 2.60%  
Due after Ten Years, Amount $ 888  
Due after Ten Years, Yield 2.99%  
Total, Amount $ 14,314  
Total, Yield 2.55%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due after One Year through Five Years, Amount 3,364  
Due after Five Years though Ten Years, Amount 10,395  
Due after Ten Years, Amount 931  
Debt securities carried at fair value 14,690  
Non-agency residential    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due in One Year or Less, Yield 0.00%  
Due after One Year through Five Years, Amount $ 0  
Due after One Year through Five Years, Yield 0.00%  
Due after Five Years though Ten Years, Amount $ 12  
Due after Five Years though Ten Years, Yield 0.00%  
Due after Ten Years, Amount $ 3,083  
Due after Ten Years, Yield 10.49%  
Total, Amount $ 3,095  
Total, Yield 10.46%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 0  
Due after One Year through Five Years, Amount 0  
Due after Five Years though Ten Years, Amount 26  
Due after Ten Years, Amount 3,459  
Debt securities carried at fair value 3,485  
U.S. Treasury and agency securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 482  
Due in One Year or Less, Yield 0.33%  
Due after One Year through Five Years, Amount $ 36,446  
Due after One Year through Five Years, Yield 1.65%  
Due after Five Years though Ten Years, Amount $ 18,803  
Due after Five Years though Ten Years, Yield 2.50%  
Due after Ten Years, Amount $ 18  
Due after Ten Years, Yield 2.54%  
Total, Amount $ 55,749  
Total, Yield 1.92%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 483  
Due after One Year through Five Years, Amount 36,629  
Due after Five Years though Ten Years, Amount 19,820  
Due after Ten Years, Amount 18  
Debt securities carried at fair value 56,950  
Non-U.S. securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 18,097  
Due in One Year or Less, Yield 1.07%  
Due after One Year through Five Years, Amount $ 762  
Due after One Year through Five Years, Yield 1.50%  
Due after Five Years though Ten Years, Amount $ 11  
Due after Five Years though Ten Years, Yield 4.38%  
Due after Ten Years, Amount $ 101  
Due after Ten Years, Yield 6.24%  
Total, Amount $ 18,971  
Total, Yield 1.12%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 18,099  
Due after One Year through Five Years, Amount 772  
Due after Five Years though Ten Years, Amount 12  
Due after Ten Years, Amount 104  
Debt securities carried at fair value 18,987  
Other taxable securities, substantially all asset-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 520  
Due in One Year or Less, Yield 3.36%  
Due after One Year through Five Years, Amount $ 2,175  
Due after One Year through Five Years, Yield 3.20%  
Due after Five Years though Ten Years, Amount $ 436  
Due after Five Years though Ten Years, Yield 3.29%  
Due after Ten Years, Amount $ 675  
Due after Ten Years, Yield 3.61%  
Total, Amount $ 3,806  
Total, Yield 3.31%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 527  
Due after One Year through Five Years, Amount 2,214  
Due after Five Years though Ten Years, Amount 463  
Due after Ten Years, Amount 682  
Debt securities carried at fair value 3,886  
Total taxable securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 19,099  
Due in One Year or Less, Yield 1.12%  
Due after One Year through Five Years, Amount $ 42,829  
Due after One Year through Five Years, Yield 1.78%  
Due after Five Years though Ten Years, Amount $ 31,104  
Due after Five Years though Ten Years, Yield 2.54%  
Due after Ten Years, Amount $ 141,754  
Due after Ten Years, Yield 3.44%  
Total, Amount $ 234,786  
Total, Yield 2.83%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 19,109  
Due after One Year through Five Years, Amount 43,099  
Due after Five Years though Ten Years, Amount 32,463  
Due after Ten Years, Amount 143,239  
Debt securities carried at fair value 237,910  
Tax-exempt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 724  
Due in One Year or Less, Yield 1.98%  
Due after One Year through Five Years, Amount $ 7,169  
Due after One Year through Five Years, Yield 2.22%  
Due after Five Years though Ten Years, Amount $ 5,483  
Due after Five Years though Ten Years, Yield 2.20%  
Due after Ten Years, Amount $ 2,887  
Due after Ten Years, Yield 2.33%  
Total, Amount $ 16,263  
Total, Yield 2.23%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 724  
Due after One Year through Five Years, Amount 7,186  
Due after Five Years though Ten Years, Amount 5,608  
Due after Ten Years, Amount 2,914  
Debt securities carried at fair value 16,432  
Debt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 19,823  
Due in One Year or Less, Yield 1.16%  
Due after One Year through Five Years, Amount $ 49,998  
Due after One Year through Five Years, Yield 1.84%  
Due after Five Years though Ten Years, Amount $ 36,587  
Due after Five Years though Ten Years, Yield 2.49%  
Due after Ten Years, Amount $ 144,641  
Due after Ten Years, Yield 3.42%  
Total, Amount $ 251,049  
Total, Yield 2.79%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in One Year or Less, Amount $ 19,833  
Due after One Year through Five Years, Amount 50,285  
Due after Five Years though Ten Years, Amount 38,071  
Due after Ten Years, Amount 146,153  
Debt securities carried at fair value $ 254,342