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DERIVATIVE INSTRUMENTS - Derivatives and Hedging Instruments Gain (Loss) Summary (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized foreign currency translation gains (losses) during period $ 824 $ 375
Derivative gains (losses) 144 (52)
Derivative and non-derivative hedging instruments gain (loss) recognized in other comprehensive income effective portion before tax [1] (86) (47)
Cash flow hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 6 2
Cash flow hedges | Foreign currency swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 6 2
Fair value hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) (51) (17)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0
Fair value hedges | Foreign currency forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) [2] (50) (31)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1],[2] 0 0
Fair value hedges | Foreign currency options    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) [2] (1) 14
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1],[2] 0 0
Net investment hedge    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0
Unrealized foreign currency translation gains (losses) during period [1] (92) (49)
Net investment hedge | Non-derivative hedging instruments    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0
Unrealized foreign currency translation gains (losses) during period [1] (84) (17)
Net investment hedge | Foreign currency forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0
Unrealized foreign currency translation gains (losses) during period [1] 0 (9)
Net investment hedge | Foreign currency options    
Derivative Instruments, Gain (Loss) [Line Items]    
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0
Unrealized foreign currency translation gains (losses) during period [1] (8) (23)
Non-qualifying strategies    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 194 (35)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0
Non-qualifying strategies | Foreign currency swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 14 (8)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0
Non-qualifying strategies | Foreign currency forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 179 (27)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0
Non-qualifying strategies | Foreign currency options    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] $ 0 $ 0
[1] Cash flow hedge items are recorded as unrealized gains (losses) on derivatives and net investment hedge items are recorded in the unrealized foreign currency translation gains (losses) line in the consolidated statement of comprehensive income (loss).
[2] Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)