Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Income Statement and AOCI Recognition (Details)

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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Income Statement and AOCI Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged items $ 0 $ 0
Derivatives designated as hedging instruments 0 0
Total amounts of income and expense line items presented in the statement of income in which the effects of fair value or cash flow hedges are recorded 23 (42)
Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged items (15) 54
Derivatives designated as hedging instruments 15 (54)
Total amounts of income and expense line items presented in the statement of income in which the effects of fair value or cash flow hedges are recorded (6) (6)
Investment income and other    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged items 0 0
Derivatives designated as hedging instruments 0 0
Total amounts of income and expense line items presented in the statement of income in which the effects of fair value or cash flow hedges are recorded 0 0
Foreign Exchange Contract [Member] | Revenue    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain or (loss) reclassified from accumulated other comprehensive income 23 (42)
Foreign Exchange Contract [Member] | Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain or (loss) reclassified from accumulated other comprehensive income 0 0
Foreign Exchange Contract [Member] | Investment income and other    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain or (loss) reclassified from accumulated other comprehensive income 0 0
Interest Rate Contract [Member] | Revenue    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain or (loss) reclassified from accumulated other comprehensive income 0 0
Interest Rate Contract [Member] | Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain or (loss) reclassified from accumulated other comprehensive income (6) (6)
Interest Rate Contract [Member] | Investment income and other    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain or (loss) reclassified from accumulated other comprehensive income $ 0 $ 0