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Investment Securities - Investment Securities (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, total, amortized cost $ 66,985 $ 61,817
Available-for-sale securities, total, fair value [1] $ 66,284 $ 61,997
Available-for-sale securities, total, weighted-average maturity in years 5 years 1 month 6 days 4 years 8 months 12 days
Available-for-sale securities, total, weighted-average yield 2.06% 2.21%
Held-to-maturity securities, total, amortized cost $ 42,991 $ 43,590
Held-to-maturity securities, total, fair value $ 42,435 $ 43,493
Held-to-maturity securities, total, weighted-average maturity in years 4 years 7 months 6 days 4 years 2 months 12 days
Held-to-maturity securities, total, weighted-average yield 1.93% 1.92%
Amortized Cost of Investment Securities $ 109,976 $ 105,407
Amortized Cost of Investment Securities, Percentage 100.00% 100.00%
U.S. Treasury and Agencies [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost $ 3,219  
Available-for-sale securities, maturing after one year through five years, amortized cost 9,509  
Available-for-sale securities, maturing after five years through ten years, amortized cost 4,285  
Available-for-sale securities, maturing after ten years, amortized cost 301  
Available-for-sale securities, total, amortized cost 17,314 $ 4,611
Available-for-sale securities, maturing in one year or less, fair value 3,218  
Available-for-sale securities, maturing after one year through five years, fair value 9,414  
Available-for-sale securities, maturing after five years through ten years, fair value 4,203  
Available-for-sale securities, maturing after ten years, fair value 292  
Available-for-sale securities, total, fair value $ 17,127 4,596
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 7 months 6 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 2 years 8 months 12 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 6 years 2 months 12 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years 10 years 2 months 12 days  
Available-for-sale securities, total, weighted-average maturity in years 3 years 3 months 18 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield 0.74%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield 1.10%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield 1.91%  
Available-for-sale securities, maturing after ten years, weighted-average yield 2.26%  
Available-for-sale securities, total, weighted-average yield 1.25%  
Held-to-maturity securities, maturing in one year or less, amortized cost $ 450  
Held-to-maturity securities, maturing after one year through five years, amortized cost 709  
Held-to-maturity securities, maturing after five years through ten years, amortized cost 4,087  
Held-to-maturity securities, total, amortized cost 5,246 2,925
Held-to-maturity securities, maturing in one year or less, fair value 450  
Held-to-maturity securities, maturing after one year through five years, fair value 715  
Held-to-maturity securities, maturing after five years through ten years, fair value 3,961  
Held-to-maturity securities, total, fair value $ 5,126 2,919
Held-to-maturity securities, maturing in one year or less, weighted-average maturity in years 6 months  
Held-to-maturity securities, maturing after one year through five years, weighted-average maturity in years 2 years 8 months 12 days  
Held-to-maturity securities, maturing after five years through ten years, weighted-average maturity in years 6 years 8 months 12 days  
Held-to-maturity securities, total, weighted-average maturity in years 5 years 7 months 6 days  
Held-to-maturity securities, maturing in one year or less, weighted-average yield 0.98%  
Held-to-maturity securities, maturing after one year through five years, weighted-average yield 1.78%  
Held-to-maturity securities, maturing after five years through ten years, weighted-average yield 1.77%  
Held-to-maturity securities, total, weighted-average yield 1.71%  
Amortized Cost of Investment Securities $ 22,560 $ 7,536
Amortized Cost of Investment Securities, Percentage 20.50% 7.20%
Mortgage-Backed Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost $ 161  
Available-for-sale securities, maturing after one year through five years, amortized cost 19,304  
Available-for-sale securities, maturing after five years through ten years, amortized cost 22,222  
Available-for-sale securities, maturing after ten years, amortized cost 2,304  
Available-for-sale securities, total, amortized cost 43,991  
Available-for-sale securities, maturing in one year or less, fair value 165  
Available-for-sale securities, maturing after one year through five years, fair value 19,279  
Available-for-sale securities, maturing after five years through ten years, fair value 21,834  
Available-for-sale securities, maturing after ten years, fair value 2,312  
Available-for-sale securities, total, fair value $ 43,590  
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 8 months 12 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 4 years 2 months 12 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 5 years 9 months 18 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years 12 years 2 months 12 days  
Available-for-sale securities, total, weighted-average maturity in years 5 years 4 months 24 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield 4.15%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield 2.06%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield 1.79%  
Available-for-sale securities, maturing after ten years, weighted-average yield 1.70%  
Available-for-sale securities, total, weighted-average yield 1.91%  
Held-to-maturity securities, maturing in one year or less, amortized cost $ 271  
Held-to-maturity securities, maturing after one year through five years, amortized cost 25,882  
Held-to-maturity securities, maturing after five years through ten years, amortized cost 11,317  
Held-to-maturity securities, maturing after ten years, amortized cost 237  
Held-to-maturity securities, total, amortized cost 37,707  
Held-to-maturity securities, maturing in one year or less, fair value 273  
Held-to-maturity securities, maturing after one year through five years, fair value 25,680  
Held-to-maturity securities, maturing after five years through ten years, fair value 11,071  
Held-to-maturity securities, maturing after ten years, fair value 239  
Held-to-maturity securities, total, fair value $ 37,263  
Held-to-maturity securities, maturing in one year or less, weighted-average maturity in years 8 months 12 days  
Held-to-maturity securities, maturing after one year through five years, weighted-average maturity in years 3 years 9 months 18 days  
Held-to-maturity securities, maturing after five years through ten years, weighted-average maturity in years 5 years 8 months 12 days  
Held-to-maturity securities, maturing after ten years, weighted-average maturity in years 11 years 1 month 6 days  
Held-to-maturity securities, total, weighted-average maturity in years 4 years 4 months 24 days  
Held-to-maturity securities, maturing in one year or less, weighted-average yield 2.83%  
Held-to-maturity securities, maturing after one year through five years, weighted-average yield 1.99%  
Held-to-maturity securities, maturing after five years through ten years, weighted-average yield 1.86%  
Held-to-maturity securities, maturing after ten years, weighted-average yield 1.62%  
Held-to-maturity securities, total, weighted-average yield 1.96%  
Amortized Cost of Investment Securities $ 81,698 $ 91,265
Amortized Cost of Investment Securities, Percentage 74.30% 86.60%
Asset-Backed Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing after one year through five years, amortized cost $ 252  
Available-for-sale securities, maturing after five years through ten years, amortized cost 223  
Available-for-sale securities, total, amortized cost 475  
Available-for-sale securities, maturing after one year through five years, fair value 256  
Available-for-sale securities, maturing after five years through ten years, fair value 227  
Available-for-sale securities, total, fair value $ 483  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 3 years 10 months 24 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 5 years 4 months 24 days  
Available-for-sale securities, total, weighted-average maturity in years 4 years 7 months 6 days  
Available-for-sale securities, maturing after one year through five years, weighted-average yield 3.18%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield 3.49%  
Available-for-sale securities, total, weighted-average yield 3.32%  
Held-to-maturity securities, maturing after one year through five years, amortized cost $ 5  
Held-to-maturity securities, maturing after five years through ten years, amortized cost 2  
Held-to-maturity securities, maturing after ten years, amortized cost 1  
Held-to-maturity securities, total, amortized cost 8  
Held-to-maturity securities, maturing after one year through five years, fair value 8  
Held-to-maturity securities, maturing after five years through ten years, fair value 2  
Held-to-maturity securities, maturing after ten years, fair value 6  
Held-to-maturity securities, total, fair value $ 16  
Held-to-maturity securities, maturing in one year or less, weighted-average maturity in years 1 month 6 days  
Held-to-maturity securities, maturing after one year through five years, weighted-average maturity in years 3 years 1 month 6 days  
Held-to-maturity securities, maturing after five years through ten years, weighted-average maturity in years 5 years 9 months 18 days  
Held-to-maturity securities, maturing after ten years, weighted-average maturity in years 11 years 6 months  
Held-to-maturity securities, total, weighted-average maturity in years 5 years  
Held-to-maturity securities, maturing in one year or less, weighted-average yield 1.38%  
Held-to-maturity securities, maturing after one year through five years, weighted-average yield 1.39%  
Held-to-maturity securities, maturing after five years through ten years, weighted-average yield 1.53%  
Held-to-maturity securities, maturing after ten years, weighted-average yield 1.52%  
Held-to-maturity securities, total, weighted-average yield 1.45%  
Amortized Cost of Investment Securities $ 483 $ 558
Amortized Cost of Investment Securities, Percentage 0.40% 0.50%
Obligations of State and Political Subdivisions [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost $ 1,573  
Available-for-sale securities, maturing after one year through five years, amortized cost 517  
Available-for-sale securities, maturing after five years through ten years, amortized cost 1,771  
Available-for-sale securities, maturing after ten years, amortized cost 1,306  
Available-for-sale securities, total, amortized cost 5,167 $ 5,149
Available-for-sale securities, maturing in one year or less, fair value 1,593  
Available-for-sale securities, maturing after one year through five years, fair value 530  
Available-for-sale securities, maturing after five years through ten years, fair value 1,732  
Available-for-sale securities, maturing after ten years, fair value 1,184  
Available-for-sale securities, total, fair value $ 5,039 5,316
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 4 months 24 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 2 years 7 months 6 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 8 years 1 month 6 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years 20 years  
Available-for-sale securities, total, weighted-average maturity in years 8 years 2 months 12 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield 7.09%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield 6.15%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield 5.30%  
Available-for-sale securities, maturing after ten years, weighted-average yield 5.05%  
Available-for-sale securities, total, weighted-average yield 5.87%  
Held-to-maturity securities, maturing after five years through ten years, amortized cost $ 6  
Held-to-maturity securities, total, amortized cost 6 8
Held-to-maturity securities, maturing after five years through ten years, fair value 7  
Held-to-maturity securities, total, fair value $ 7 8
Held-to-maturity securities, maturing in one year or less, weighted-average maturity in years 3 months 18 days  
Held-to-maturity securities, maturing after one year through five years, weighted-average maturity in years 2 years 6 months  
Held-to-maturity securities, maturing after five years through ten years, weighted-average maturity in years 8 years 9 months 18 days  
Held-to-maturity securities, total, weighted-average maturity in years 8 years 4 months 24 days  
Held-to-maturity securities, maturing in one year or less, weighted-average yield 8.20%  
Held-to-maturity securities, maturing after one year through five years, weighted-average yield 8.15%  
Held-to-maturity securities, maturing after five years through ten years, weighted-average yield 3.30%  
Held-to-maturity securities, total, weighted-average yield 3.59%  
Amortized Cost of Investment Securities $ 5,173 $ 5,157
Amortized Cost of Investment Securities, Percentage 4.70% 4.90%
Other Debt Securities and Obligations of Foreign Governments [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing after ten years, amortized cost $ 11  
Available-for-sale securities, total, amortized cost 11  
Available-for-sale securities, maturing after ten years, fair value 9  
Available-for-sale securities, total, fair value $ 9  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years 20 years 4 months 24 days  
Available-for-sale securities, total, weighted-average maturity in years 20 years 4 months 24 days  
Available-for-sale securities, maturing after ten years, weighted-average yield 5.65%  
Available-for-sale securities, total, weighted-average yield 5.65%  
Held-to-maturity securities, maturing in one year or less, amortized cost $ 8  
Held-to-maturity securities, maturing after one year through five years, amortized cost 16  
Held-to-maturity securities, total, amortized cost 24  
Held-to-maturity securities, maturing in one year or less, fair value 8  
Held-to-maturity securities, maturing after one year through five years, fair value 15  
Held-to-maturity securities, total, fair value $ 23  
Held-to-maturity securities, maturing in one year or less, weighted-average maturity in years 3 months 18 days  
Held-to-maturity securities, maturing after one year through five years, weighted-average maturity in years 3 years 9 months 18 days  
Held-to-maturity securities, total, weighted-average maturity in years 2 years 7 months 6 days  
Held-to-maturity securities, maturing in one year or less, weighted-average yield 2.15%  
Held-to-maturity securities, maturing after one year through five years, weighted-average yield 1.65%  
Held-to-maturity securities, total, weighted-average yield 1.82%  
Amortized Cost of Investment Securities $ 62 $ 891
Amortized Cost of Investment Securities, Percentage 0.10% 0.80%
Other Investments Including Perpetual Preferred Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, total, amortized cost $ 27  
Available-for-sale securities, total, fair value $ 36  
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.