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Securities-Maturity Distribution by Carrying Amount and Yield (on Tax Equivalent Basis) of Investment Securities Portfolio (Detail) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Securities available-for-sale:  
One year or less $ 9,547
Over 1 through 5 years 20,715
Over 5 through 10 years 5,629
Over 10 years 3,792
Total 79,608
Securities held-to-maturity:  
One year or less 2,047
Over 1 through 5 years 10,963
Over 5 through 10 years 3,260
Over 10 years 15
Total 43,426
Mortgage-backed securities  
Securities available-for-sale:  
Without single maturity date 33,545
Securities held-to-maturity:  
Mortgage-backed securities 27,141
Asset-backed securities  
Securities available-for-sale:  
Without single maturity date 5,593
Equity securities  
Securities available-for-sale:  
Without single maturity date [1] 787
U.S. Treasury  
Securities available-for-sale:  
One year or less 2,879
Over 1 through 5 years 5,609
Over 5 through 10 years 1,259
Over 10 years 3,320
Total 13,067
Securities held-to-maturity:  
One year or less 514
Over 1 through 5 years 8,096
Over 5 through 10 years 2,561
Over 10 years 0
Total $ 11,171
Securities available-for-sale (percent):  
One year or less (percent) [2] 0.82%
Over 1 through 5 years (percent) [2] 1.37%
Over 5 through 10 years (percent) [2] 2.12%
Over 10 years (percent) [2] 3.11%
Total (percent) [2] 1.76%
Securities held-to-maturity (percent):  
One year or less (percent) [2] 1.30%
Over 1 through 5 years (percent) [2] 1.04%
Over 5 through 10 years (percent) [2] 2.06%
Over 10 years (percent) [2] 0.00%
Total (percent) [2] 1.28%
U.S. Government agencies  
Securities available-for-sale:  
One year or less $ 177
Over 1 through 5 years 133
Over 5 through 10 years 100
Over 10 years 0
Total 410
Securities held-to-maturity:  
One year or less 0
Over 1 through 5 years 1,447
Over 5 through 10 years 0
Over 10 years 0
Total $ 1,447
Securities available-for-sale (percent):  
One year or less (percent) [2] 2.06%
Over 1 through 5 years (percent) [2] 1.56%
Over 5 through 10 years (percent) [2] 2.57%
Over 10 years (percent) [2] 0.00%
Total (percent) [2] 2.02%
Securities held-to-maturity (percent):  
One year or less (percent) [2] 0.00%
Over 1 through 5 years (percent) [2] 1.40%
Over 5 through 10 years (percent) [2] 0.00%
Over 10 years (percent) [2] 0.00%
Total (percent) [2] 1.40%
State and political subdivisions  
Securities available-for-sale:  
One year or less $ 558
Over 1 through 5 years 2,346
Over 5 through 10 years 1,393
Over 10 years 230
Total 4,527
Securities held-to-maturity:  
One year or less 0
Over 1 through 5 years 1
Over 5 through 10 years 5
Over 10 years 15
Total $ 21
Securities available-for-sale (percent):  
One year or less (percent) [2] 1.45%
Over 1 through 5 years (percent) [2] 2.58%
Over 5 through 10 years (percent) [2] 3.83%
Over 10 years (percent) [2] 1.69%
Total (percent) [2] 2.78%
Securities held-to-maturity (percent):  
One year or less (percent) [2] 0.00%
Over 1 through 5 years (percent) [2] 7.12%
Over 5 through 10 years (percent) [2] 6.82%
Over 10 years (percent) [2] 5.34%
Total (percent) [2] 5.80%
Other bonds, notes and debentures  
Securities available-for-sale:  
One year or less $ 5,933
Over 1 through 5 years 12,627
Over 5 through 10 years 2,877
Over 10 years 242
Total 21,679
Securities held-to-maturity:  
One year or less 1,533
Over 1 through 5 years 1,419
Over 5 through 10 years 694
Over 10 years 0
Total $ 3,646
Securities available-for-sale (percent):  
One year or less (percent) [2] 0.64%
Over 1 through 5 years (percent) [2] 0.94%
Over 5 through 10 years (percent) [2] 2.12%
Over 10 years (percent) [2] 1.43%
Total (percent) [2] 1.02%
Securities held-to-maturity (percent):  
One year or less (percent) [2] 0.07%
Over 1 through 5 years (percent) [2] 0.60%
Over 5 through 10 years (percent) [2] 0.78%
Over 10 years (percent) [2] 0.00%
Total (percent) [2] 0.41%
Mortgage/ asset-backed and equity securities  
Securities available-for-sale:  
Total $ 39,925
Securities held-to-maturity:  
Total $ 27,141
Securities available-for-sale (percent):  
Total (percent) [2] 2.47%
Securities held-to-maturity (percent):  
Total (percent) [2] 2.73%
Mortgage/ asset-backed and equity securities | Mortgage-backed securities  
Securities available-for-sale:  
Without single maturity date $ 33,545
Securities held-to-maturity:  
Mortgage-backed securities $ 27,141
Securities available-for-sale (percent):  
Without single maturity date (percent) [2] 2.75%
Securities held-to-maturity (percent):  
Without single maturity date (percent) [2] 2.73%
Mortgage/ asset-backed and equity securities | Asset-backed securities  
Securities available-for-sale:  
Without single maturity date $ 5,593
Securities available-for-sale (percent):  
Without single maturity date (percent) [2] 1.12%
Mortgage/ asset-backed and equity securities | Equity securities  
Securities available-for-sale:  
Without single maturity date [1] $ 787
Securities available-for-sale (percent):  
Without single maturity date (percent) [1],[2] 0.00%
[1] Includes money market funds.
[2] Yields are based upon the amortized cost of securities.