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Carrying Amounts and Fair Values of the Company's Financial Instruments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financial assets    
Trading assets [1] $ 6,119 $ 6,202
Available-for-sale Securities [2] 27,825 26,770
Loans Held-for-sale, Fair Value Disclosure 1,494 1,892
Financial liabilities    
Long-term Debt, Fair Value 973 1,283
Trading liabilities 1,263 1,227
Reported Value Measurement [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure 5,599 8,229 [3]
Trading assets 6,119 6,202
Available-for-sale Securities 27,825 26,770
Loans Held-for-sale, Fair Value Disclosure 1,838 3,232
Loans Net Fair Value Disclosure 134,690 131,175
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure 149,830 140,567
Short-term Debt, Fair Value 4,627 9,186
Long-term Debt, Fair Value 8,462 13,022
Trading liabilities 1,263 1,227
Estimate of Fair Value Measurement [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure 5,599 8,229 [3]
Trading assets 6,119 6,202
Available-for-sale Securities 27,825 26,770
Loans Held-for-sale, Fair Value Disclosure 1,842 3,240
Loans Net Fair Value Disclosure 131,178 126,855
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure 149,889 140,562
Short-term Debt, Fair Value 4,627 9,186
Long-term Debt, Fair Value 8,374 13,056
Trading liabilities 1,263 1,227
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure 5,599 8,229 [3]
Trading assets 866 1,000
Available-for-sale Securities 3,542 2,059
Loans Held-for-sale, Fair Value Disclosure 0 0
Loans Net Fair Value Disclosure 0 0
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure 0 0
Short-term Debt, Fair Value 0 0
Long-term Debt, Fair Value 0 0
Trading liabilities 664 929
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure 0 0 [3]
Trading assets 5,143 5,177
Available-for-sale Securities 23,727 23,765
Loans Held-for-sale, Fair Value Disclosure 1,803 2,063
Loans Net Fair Value Disclosure 397 545
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure 149,889 140,562
Short-term Debt, Fair Value 4,627 9,186
Long-term Debt, Fair Value 7,772 12,398
Trading liabilities 593 293
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure 0 0 [3]
Trading assets 110 25
Available-for-sale Securities 556 946
Loans Held-for-sale, Fair Value Disclosure 39 1,177
Loans Net Fair Value Disclosure 130,781 126,310
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure 0 0
Short-term Debt, Fair Value 0 0
Long-term Debt, Fair Value 602 658
Trading liabilities 6 5
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 866 1,000
Available-for-sale Securities 3,542 2,059
Financial liabilities    
Long-term Debt, Fair Value 0 0
Trading liabilities 664 929
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Trading assets 8,456 9,709
Available-for-sale Securities 23,727 23,765
Financial liabilities    
Long-term Debt, Fair Value 973 1,283
Trading liabilities 4,557 5,408
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Trading assets 110 25
Available-for-sale Securities 556 946
Financial liabilities    
Long-term Debt, Fair Value 0 0
Trading liabilities 6 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 553 545
Available-for-sale Securities 23,124 23,048
Financial liabilities    
Trading liabilities 37 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 $1,377 million and $1,316 million at December 31, 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 December 31, 2015 and December 31, 2014, respectively.
[3] Cash and cash equivalents are valued at their carrying amounts, which are reasonable estimates of fair value due to the relatively short period to maturity of the instruments.