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DERIVATIVE INSTRUMENTS - Derivatives and Hedging Instruments Gain (Loss) Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized foreign currency translation gains (losses) during period $ 286 $ 283 $ 360
Derivative and other gains (losses) (109) (255) (10)
Derivative and non-derivative hedging instruments gain loss recognized in other comprehensive income effective portion before tax [1] (34) (42) 7
Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) 0 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 1 3 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 1 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 1 3 0
Fair value hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) (169) (384) (131)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 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] (180) (359) (138)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1],[2] 0 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] 11 (25) 3
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1],[2] 0 0 0
Fair value hedges | Interest rate swaptions      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) [2] 0 0 4
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1],[2] 0 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 0
Unrealized foreign currency translation gains (losses) during period [1] (35) (45) 7
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
Unrealized foreign currency translation gains (losses) during period [1] (25) (118) 4
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
Unrealized foreign currency translation gains (losses) during period [1] 5 73 0
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
Unrealized foreign currency translation gains (losses) during period [1] (15) 0 3
Non-qualifying strategies      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 60 128 121
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0 0
Non-qualifying strategies | Foreign currency swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 53 117 16
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0 0
Non-qualifying strategies | Foreign currency forwards      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 8 9 100
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0 0
Non-qualifying strategies | Credit default swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net (1) 2 1
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0 0
Non-qualifying strategies | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 0 0 5
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 0 0 0
Non-qualifying strategies | Futures      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 0 0 (1)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] $ 0 $ 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)