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Carrying Amounts and Fair Values of the Company's Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financial assets    
Trading assets [1] $ 6,318 $ 6,067
Available-for-sale Securities [2] 31,444 30,672
Loans Held-for-sale, Fair Value Disclosure 2,252 3,540
Fair Value, Inputs, Level 1 [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure [3] 8,278 6,423
Trading assets [4] 746 881
Available-for-sale Securities [4] 4,305 5,507
Loans Held-for-sale, Fair Value Disclosure [5] 0 0
Loans Net Fair Value Disclosure [6] 0 0
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure [7] 0 0
Short-term Debt, Fair Value [8] 0 0
Long-term Debt, Fair Value [8] 0 0
Trading liabilities [4] 707 846
Fair Value, Inputs, Level 2 [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure [3] 0 0
Trading assets [4] 5,549 5,158
Available-for-sale Securities [4] 26,591 24,532
Loans Held-for-sale, Fair Value Disclosure [5] 2,653 4,161
Loans Net Fair Value Disclosure [6] 121 282
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure [7] 162,590 160,280
Short-term Debt, Fair Value [8] 5,449 4,764
Long-term Debt, Fair Value [8] 10,363 11,051
Trading liabilities [4] 560 483
Fair Value, Inputs, Level 3 [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure [3] 0 0
Trading assets [4] 23 28
Available-for-sale Securities [4] 548 633
Loans Held-for-sale, Fair Value Disclosure [5] 196 17
Loans Net Fair Value Disclosure [6] 142,361 140,234
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure [7] 0 0
Short-term Debt, Fair Value [8] 0 0
Long-term Debt, Fair Value [8] 1,026 728
Trading liabilities [4] 17 22
Reported Value Measurement [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure [3] 8,278 6,423
Trading assets [4] 6,318 6,067
Available-for-sale Securities [4] 31,444 30,672
Loans Held-for-sale, Fair Value Disclosure [5] 2,835 4,169
Loans Net Fair Value Disclosure [6] 142,492 141,589
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure [7] 162,737 160,398
Short-term Debt, Fair Value [8] 5,449 4,764
Long-term Debt, Fair Value [8] 11,280 11,748
Trading liabilities [4] 1,284 1,351
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial assets    
Cash and Cash Equivalents, Fair Value Disclosure [3] 8,278 6,423
Trading assets [4] 6,318 6,067
Available-for-sale Securities [4] 31,444 30,672
Loans Held-for-sale, Fair Value Disclosure [5] 2,849 4,178
Loans Net Fair Value Disclosure [6] 142,482 140,516
Financial liabilities    
Consumer And Commercial Deposits, Fair Value Disclosure [7] 162,590 160,280
Short-term Debt, Fair Value [8] 5,449 4,764
Long-term Debt, Fair Value [8] 11,389 11,779
Trading liabilities [4] $ 1,284 $ 1,351
[1] Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,043 million and $1,437 million at September 30, 2017 and December 31, 2016, respectively.
[2] Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $280 million and $0 million at September 30, 2017 and December 31, 2016, 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.
[4] Trading assets and derivative instruments, securities AFS, and trading liabilities and derivative instruments that are classified as level 1 are valued based on quoted prices observed in active markets. For those instruments classified as level 2 or 3, refer to the respective valuation discussions within this footnote.
[5] LHFS are generally valued based on observable current market prices or, if quoted market prices are not available, quoted market prices of similar instruments. Refer to the LHFS section within this footnote for further discussion. When valuation assumptions are not readily observable in the market, instruments are valued based on the best available data to approximate fair value. This data may be internally developed and considers risk premiums that a market participant would require under then-current market conditions.
[6] LHFI fair values are based on a hypothetical exit price, which does not represent the estimated intrinsic value of the loan if held for investment. The assumptions used are expected to approximate those that a market participant purchasing the loans would use to value the loans, including a market risk premium and liquidity discount. Estimating the fair value of the loan portfolio when loan sales and trading markets are illiquid or nonexistent requires significant judgment.Generally, the Company measures fair value for LHFI based on estimated future discounted cash flows using current origination rates for loans with similar terms and credit quality, which derived an estimated value of 101% on the loan portfolio’s net carrying value at both September 30, 2017 and December 31, 2016. The value derived from origination rates likely does not represent an exit price; therefore, an incremental market risk and liquidity discount was applied when estimating the fair value of these loans. The discounted value is a function of a market participant’s required yield in the current environment and is not a reflection of the expected cumulative losses on the loans.
[7] Deposit liabilities with no defined maturity such as DDAs, NOW/money market accounts, and savings accounts have a fair value equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). Fair values for CDs are estimated using a discounted cash flow approach that applies current interest rates to a schedule of aggregated expected maturities. The assumptions used in the discounted cash flow analysis are expected to approximate those that market participants would use in valuing deposits. The value of long-term relationships with depositors is not taken into account in estimating fair values. Refer to the respective valuation section within this footnote for valuation information related to brokered time deposits that the Company measures at fair value as well as those that are carried at amortized cost.
[8] Fair values for short-term borrowings and certain long-term debt are based on quoted market prices for similar instruments or estimated discounted cash flows utilizing the Company’s current incremental borrowing rate for similar types of instruments. Refer to the respective valuation section within this footnote for valuation information related to long-term debt that the Company measures at fair value. For level 3 debt, the terms are unique in nature or there are no similar instruments that can be used to value the instrument without using significant unobservable assumptions. In these situations, the Company reviews current borrowing rates along with the collateral levels that secure the debt in determining an appropriate fair value adjustment.