Annual report pursuant to Section 13 and 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Amount Recorded in Income Statements for Foreign Currency Forward Contracts Not Designated as Hedges (Detail)

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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Amount Recorded in Income Statements for Foreign Currency Forward Contracts Not Designated as Hedges (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 0 $ 0
Gain (Loss) on Fair Value Of Derivatives Designated As Hedged Item Recognized in Earnings 0 0
Other Comprehensive Income (Loss) Gain (Loss), after Reclassification and Tax, Parent 177 (50)
Investment Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Fair Value Hedges Recognized in Earnings 0 0
Gain (Loss) on Fair Value Of Derivatives Designated As Hedged Item Recognized in Earnings 0 0
Other Comprehensive Income (Loss) Gain (Loss), after Reclassification and Tax, Parent 0 0
Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) on Fair Value Hedges Recognized in Earnings (38) 57
Gain (Loss) on Fair Value Of Derivatives Designated As Hedged Item Recognized in Earnings 38 (57)
Other Comprehensive Income (Loss) Gain (Loss), after Reclassification and Tax, Parent (15) (24)
Foreign exchange contracts | Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 177 (50)
Foreign exchange contracts | Investment Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0 0
Foreign exchange contracts | Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0 0
Interest rate contracts | Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0 0
Interest rate contracts | Investment Income [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0 0
Interest rate contracts | Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (15) (24)
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income (10) (95)
Not Designated as Hedging Instrument | Foreign exchange contracts | Investment income and other    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income (1) (102)
Not Designated as Hedging Instrument | Interest rate contracts | Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income (9) (9)
Not Designated as Hedging Instrument | Investment market price contracts | Investment income and other    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income 0 16
Net Investment Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 75 211
Net Investment Hedging | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 75 211
Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 256 564
Cash Flow Hedging | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 250 563
Cash Flow Hedging | Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 6 $ 1