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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Document Period End Date Sep. 30, 2017  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 28  
Derivative Asset, Fair Value, Gross Asset 3,812 $ 4,514
Derivative Liability, Fair Value, Gross Liability 4,408 4,902
Netted counterparty balance gains [Member]    
Fair Value, Concentration of Risk, Derivative Instruments, Assets 974 1,100
Netted counterparty balance [Member]    
Fair Value, Concentration of Risk, Derivative Instruments, Assets 636 774
Derivative Asset, Fair Value of Collateral 338 339
Derivative Credit Risk Valuation Adjustment, Derivative Assets 6 6
Credit Default Swap, Buying Protection [Member]    
Derivative, Notional Amount 10 135
Credit Risk Derivatives, at Fair Value, Net   3
Derivative liability positions containing provisions conditioned on downgrades [Member]    
Derivative Liability, Fair Value, Gross Liability 1,300 1,100
Additional Termination Event [Member]    
Derivative Liability, Fair Value, Gross Liability 1  
Total Return Swap [Member]    
Derivative, Notional Amount 2,500 2,100
Derivative Asset, Fair Value, Gross Asset 17 34
Derivative Liability, Fair Value, Gross Liability 13 31
Collateral Already Posted, Aggregate Fair Value $ 552 $ 450
Financial Guarantee [Member]    
Derivative, Average Remaining Maturity 5 years 7 months 8 years 6 months
Credit Derivative, Maximum Exposure, Undiscounted $ 60 $ 95
Credit Support Annex [Member]    
Derivative Liability, Fair Value, Gross Liability 1,300  
Collateral Already Posted, Aggregate Fair Value $ 1,200  
Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Derivative, Average Remaining Maturity 3 years 9 months 4 years 1 month
Derivative Asset, Fair Value, Gross Asset $ 3 [1] $ 34 [2]
Derivative Liability, Fair Value, Gross Liability 187 [1] $ 265 [2]
Maximum [Member] | Additional Termination Event [Member]    
Derivative Liability, Fair Value, Gross Liability $ 16  
Maximum [Member] | Financial Guarantee [Member]    
Derivative, Remaining Maturity 9 years 31 years
Maximum [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Derivative, Remaining Maturity 5 years 6 years
Minimum [Member] | Financial Guarantee [Member]    
Derivative, Remaining Maturity 1 year 1 year
Minimum [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Derivative, Remaining Maturity 1 year 1 year
Baa3/BBB- [Member] | Credit Support Annex [Member]    
Additional Collateral, Aggregate Fair Value $ 2  
[1] See “Cash Flow Hedges” in this Note for further discussion.
[2] See “Cash Flow Hedges” in this Note for further discussion.