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DERIVATIVE INSTRUMENTS - Derivatives and Hedging Instruments Gain (Loss) Summary (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized foreign currency translation gains (losses) during period $ (383) $ (58) $ (51) $ 325
Derivative gains (losses) (162) (40) (190) (143)
Derivative and non-derivative hedging instruments gain (loss) recognized in other comprehensive income effective portion before tax [1] 34 3 1 (34)
Cash flow hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] (2) (1) 2 0
Cash flow hedges | Foreign currency swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] (2) (1) 2 0
Fair value hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) (30) (67) (112) (140)
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] (23) (53) (102) (133)
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] (7) (14) (10) (7)
Net investment hedge        
Derivative Instruments, Gain (Loss) [Line Items]        
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 0 0 0
Unrealized foreign currency translation gains (losses) during period [1] 36 4 (1) (34)
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 0 0
Unrealized foreign currency translation gains (losses) during period [1] 36 5 7 (13)
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 0 0
Unrealized foreign currency translation gains (losses) during period [1] 0 4 0 (24)
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 0 0
Unrealized foreign currency translation gains (losses) during period [1] 0 (5) (8) 3
Non-qualifying strategies        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (132) 27 (79) (3)
Non-qualifying strategies | Foreign currency swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 23 17 51 43
Non-qualifying strategies | Foreign currency forwards        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net (154) 10 (129) (46)
Non-qualifying strategies | Foreign currency options        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 0 0 0 0
Non-qualifying strategies | Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (1) $ 0 $ (1) $ 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)