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, 2020
Dec. 31, 2019
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 196 177
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 (8) (38)
Gain (Loss) on Fair Value Of Derivatives Designated As Hedged Item Recognized in Earnings 8 38
Other Comprehensive Income (Loss) Gain (Loss), after Reclassification and Tax, Parent (8) (15)
Foreign currency exchange contracts | Revenue [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 196 177
Foreign currency 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 currency 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 (8) (15)
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income 18 (10)
Not Designated as Hedging Instrument | Foreign currency exchange contracts | Investment income and other    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income 27 (1)
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)
Net Investment Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (265) 75
Net Investment Hedging | Foreign currency exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (265) 75
Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (253) 256
Cash Flow Hedging | Foreign currency exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (253) 250
Cash Flow Hedging | Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 0 $ 6