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Securities - Maturity Distribution by Carrying Amount and Yield (on Tax Equivalent Basis) of Investment Securities Portfolio (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Securities available-for-sale:  
One year or less $ 6,245
Over 1 through 5 years 19,093
Over 5 through 10 years 8,619
Over 10 years 3,875
Total 78,274
Securities held-to-maturity:  
One year or less 6,679
Over 1 through 5 years 5,071
Over 5 through 10 years 2,136
Over 10 years 14
Total 40,986
Mortgage-backed securities  
Securities available-for-sale:  
Without single maturity date 35,571
Securities held-to-maturity:  
Mortgage-backed securities 27,086
Asset-backed securities  
Securities available-for-sale:  
Without single maturity date 3,972
Equity securities  
Securities available-for-sale:  
Without single maturity date 899
U.S. Treasury  
Securities available-for-sale:  
One year or less 2,559
Over 1 through 5 years 4,830
Over 5 through 10 years 4,289
Over 10 years 3,491
Total $ 15,169
Securities available-for-sale (Yield):  
One year or less 0.99%
Over 1 through 5 years 1.65%
Over 5 through 10 years 1.89%
Over 10 years 3.11%
Total 1.94%
Securities held-to-maturity:  
One year or less $ 5,328
Over 1 through 5 years 3,636
Over 5 through 10 years 1,407
Over 10 years 0
Total $ 10,371
Securities held-to-maturity (Yield):  
One year or less 0.95%
Over 1 through 5 years 1.67%
Over 5 through 10 years 1.92%
Over 10 years 0.00%
Total 1.33%
U.S. government agencies  
Securities available-for-sale:  
One year or less $ 0
Over 1 through 5 years 129
Over 5 through 10 years 426
Over 10 years 0
Total $ 555
Securities available-for-sale (Yield):  
One year or less 0.00%
Over 1 through 5 years 1.29%
Over 5 through 10 years 2.48%
Over 10 years 0.00%
Total 2.20%
Securities held-to-maturity:  
One year or less $ 550
Over 1 through 5 years 1,064
Over 5 through 10 years 25
Over 10 years 0
Total $ 1,639
Securities held-to-maturity (Yield):  
One year or less 0.91%
Over 1 through 5 years 1.30%
Over 5 through 10 years 2.25%
Over 10 years 0.00%
Total 1.18%
State and political subdivisions  
Securities available-for-sale:  
One year or less $ 358
Over 1 through 5 years 1,663
Over 5 through 10 years 1,068
Over 10 years 193
Total $ 3,282
Securities available-for-sale (Yield):  
One year or less 2.60%
Over 1 through 5 years 2.99%
Over 5 through 10 years 3.48%
Over 10 years 2.14%
Total 3.05%
Securities held-to-maturity:  
One year or less $ 0
Over 1 through 5 years 1
Over 5 through 10 years 2
Over 10 years 14
Total $ 17
Securities held-to-maturity (Yield):  
One year or less 0.00%
Over 1 through 5 years 6.91%
Over 5 through 10 years 6.84%
Over 10 years 5.33%
Total 5.64%
Other bonds, notes and debentures  
Securities available-for-sale:  
One year or less $ 3,328
Over 1 through 5 years 12,471
Over 5 through 10 years 2,836
Over 10 years 191
Total $ 18,826
Securities available-for-sale (Yield):  
One year or less 1.04%
Over 1 through 5 years 1.00%
Over 5 through 10 years 0.83%
Over 10 years 1.64%
Total 0.99%
Securities held-to-maturity:  
One year or less $ 801
Over 1 through 5 years 370
Over 5 through 10 years 702
Over 10 years 0
Total $ 1,873
Securities held-to-maturity (Yield):  
One year or less 0.61%
Over 1 through 5 years 0.69%
Over 5 through 10 years 0.71%
Over 10 years 0.00%
Total 0.66%
Mortgage/ asset-backed and equity securities  
Securities available-for-sale:  
Total $ 40,442
Securities available-for-sale (Yield):  
Total 2.63%
Securities held-to-maturity:  
Total $ 27,086
Securities held-to-maturity (Yield):  
Total 2.78%
Mortgage/ asset-backed and equity securities | Mortgage-backed securities  
Securities available-for-sale:  
Without single maturity date $ 35,571
Securities available-for-sale (Yield):  
Without single maturity date 2.75%
Securities held-to-maturity:  
Mortgage-backed securities $ 27,086
Securities held-to-maturity (Yield):  
Without single maturity date 2.78%
Mortgage/ asset-backed and equity securities | Asset-backed securities  
Securities available-for-sale:  
Without single maturity date $ 3,972
Securities available-for-sale (Yield):  
Without single maturity date 2.19%
Mortgage/ asset-backed and equity securities | Equity securities  
Securities available-for-sale:  
Without single maturity date $ 899
Securities available-for-sale (Yield):  
Without single maturity date 0.00%