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Carrying Amounts and Fair Values of the Company's Financial Instruments (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Financial assets    
Trading assets [1] $ 6,438 $ 6,202
Available-for-sale Securities [2] 27,113 26,770
Loans Held-for-sale, Fair Value Disclosure 1,866 1,892
Financial liabilities    
Long-term Debt, Fair Value 1,263 1,283
Trading liabilities 1,308 1,227
Reported Value Measurement [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure 7,288 8,229
Trading assets 6,438 6,202
Available-for-sale Securities 27,113 26,770
Loans Held-for-sale, Fair Value Disclosure 2,457 3,232
Loans Net Fair Value Disclosure 130,704 131,175
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure 144,937 140,567
Short Term Borrowings Fair Value Disclosure 6,117 9,186
Long-term Debt, Fair Value 10,109 13,022
Trading liabilities 1,308 1,227
Affordable Housing [Member]    
Gains (Losses) on Sales of Investment Real Estate (19)  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Trading assets 1,162 1,000
Available-for-sale Securities 2,971 2,059
Financial liabilities    
Long-term Debt, Fair Value 0 0
Trading liabilities 975 929
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Trading assets 9,283 9,709
Available-for-sale Securities 23,423 23,765
Financial liabilities    
Long-term Debt, Fair Value 1,263 1,283
Trading liabilities 5,042 5,408
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Trading assets 24 25
Available-for-sale Securities 719 946
Financial liabilities    
Long-term Debt, Fair Value 0 0
Trading liabilities 10 5
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Trading assets 0 0
Available-for-sale Securities 0 0
Financial liabilities    
Trading liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Trading assets 612 545
Available-for-sale Securities 22,733 23,048
Financial liabilities    
Trading liabilities 1 1
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Trading assets 0 0
Available-for-sale Securities 0 0
Financial liabilities    
Trading liabilities $ 0 $ 0
[1] Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,481 million and $1,316 million at June 30, 2015 and December 31, 2014, respectively
[2] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $0 million and $369 million at June 30, 2015 and December 31, 2014, respectively.