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Fair Value Measurements - Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 3,410,000,000 $ 3,577,000,000
Liabilities, Fair Value Disclosure, Recurring (2,039,000,000) (2,862,000,000)
Collateralized debt obligations [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 191,000,000 $ 221,000,000
Collateralized debt obligations [Member] | Recurring [Member] | Minimum [Member] | Broker quotes or consensus pricing and, where applicable, discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Prepayment Rate 2.00% 1.00%
Fair Value Inputs, Probability of Default 6.00% 3.00%
Fair Value Inputs, Loss Severity 90.00% 90.00%
Collateralized debt obligations [Member] | Recurring [Member] | Maximum [Member] | Broker quotes or consensus pricing and, where applicable, discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Prepayment Rate 5.00% 6.00%
Fair Value Inputs, Probability of Default 7.00% 7.00%
Fair Value Inputs, Loss Severity 95.00% 99.00%
Corporate and other domestic debt securities [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 2,884,000,000 $ 2,870,000,000
Corporate and other domestic debt securities [Member] | Recurring [Member] | Minimum [Member] | Discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Spread Volatility on Collateral Assets 2.00% 2.00%
Corporate and other domestic debt securities [Member] | Recurring [Member] | Maximum [Member] | Discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Spread Volatility on Collateral Assets 4.00% 4.00%
Corporate and other domestic debt securities [Member] | Recurring [Member] | Weighted Average [Member] | Discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Correlation Between Insurance Claim Shortfall and Collateral Value 80.00% 80.00%
Credit contracts [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 207,000,000 $ 179,000,000
Credit contracts [Member] | Recurring [Member] | Minimum [Member] | Option pricing model [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Correlation of Defaults of Portfolio of Reference Credit Names   44.00%
Fair Value Inputs, Issuer by Issuer Correlation of Defaults 82.00% 82.00%
Credit contracts [Member] | Recurring [Member] | Maximum [Member] | Option pricing model [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Correlation of Defaults of Portfolio of Reference Credit Names   47.00%
Fair Value Inputs, Issuer by Issuer Correlation of Defaults 83.00% 83.00%
Equity contracts [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 5,000,000 [1] $ (83,000,000)
Equity contracts [Member] | Recurring [Member] | Minimum [Member] | Option pricing model [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Equity/Equity Index Volatility [1] 10.00% 14.00%
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [1] 47.00% 48.00%
Fair Value Inputs, Equity Dividend Yields [1] 0.00% 0.00%
Equity contracts [Member] | Recurring [Member] | Maximum [Member] | Option pricing model [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Equity/Equity Index Volatility [1] 50.00% 72.00%
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [1] 58.00% 59.00%
Fair Value Inputs, Equity Dividend Yields [1] 15.00% 18.00%
Foreign exchange contracts [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring [1] $ 0 $ 0
Foreign exchange contracts [Member] | Recurring [Member] | Minimum [Member] | Option pricing model [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Implied Volatility Currency Pairs [1] 15.00% 18.00%
Foreign exchange contracts [Member] | Recurring [Member] | Maximum [Member] | Option pricing model [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Implied Volatility Currency Pairs [1] 21.00% 22.00%
Interest rate contracts [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 1,000,000 $ 1,000,000
Interest rate contracts [Member] | Recurring [Member] | Minimum [Member] | Market comparable adjusted for probability to fund [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Probability to Fund for Rate Lock Commitments 38.00% 18.00%
Interest rate contracts [Member] | Recurring [Member] | Maximum [Member] | Market comparable adjusted for probability to fund [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Probability to Fund for Rate Lock Commitments 100.00% 100.00%
Mortgage servicing rights [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Assets, Fair Value Disclosure, Recurring   $ 140,000,000
Mortgage servicing rights [Member] | Recurring [Member] | Minimum [Member] | Option adjusted discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Prepayment Rate   11.00%
Fair Value Inputs, Option Adjusted Spread   8.00%
Fair Value Inputs, Estimated Annualized Costs to Service   $ 87
Mortgage servicing rights [Member] | Recurring [Member] | Maximum [Member] | Option adjusted discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Prepayment Rate   50.00%
Fair Value Inputs, Option Adjusted Spread   14.00%
Fair Value Inputs, Estimated Annualized Costs to Service   $ 329
Domestic Deposits [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Liabilities, Fair Value Disclosure, Recurring [1],[2] $ (1,404,000,000) $ (1,867,000,000)
Domestic Deposits [Member] | Recurring [Member] | Minimum [Member] | Option adjusted discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Implied Volatility Currency Pairs [1],[2] 15.00% 18.00%
Fair Value Inputs, Equity/Equity Index Volatility [1],[2] 10.00% 14.00%
Fair Value Inputs, Equity/Equity and Equity/Index Correlation 47.00% 48.00%
Domestic Deposits [Member] | Recurring [Member] | Maximum [Member] | Option adjusted discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Implied Volatility Currency Pairs [1],[2] 21.00% 22.00%
Fair Value Inputs, Equity/Equity Index Volatility [1],[2] 50.00% 72.00%
Fair Value Inputs, Equity/Equity and Equity/Index Correlation 58.00% 59.00%
Long-term debt [Member] | Level 3 [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Liabilities, Fair Value Disclosure, Recurring [1],[2] $ (513,000,000) $ (746,000,000)
Long-term debt [Member] | Recurring [Member] | Minimum [Member] | Option adjusted discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Implied Volatility Currency Pairs [1],[2] 15.00% 18.00%
Fair Value Inputs, Equity/Equity Index Volatility [1],[2] 10.00% 14.00%
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [1],[2] 47.00% 48.00%
Long-term debt [Member] | Recurring [Member] | Maximum [Member] | Option adjusted discounted cash flows [Member]    
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]    
Fair Value Inputs, Implied Volatility Currency Pairs [1],[2] 21.00% 22.00%
Fair Value Inputs, Equity/Equity Index Volatility [1],[2] 50.00% 72.00%
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [1],[2] 58.00% 59.00%
[1] We are the client-facing entity and we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market neutral. The corresponding intra-group derivatives are presented as equity derivatives and foreign exchange derivatives in the table.
[2] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs.