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DERIVATIVE INSTRUMENTS - Derivatives and Hedging Instruments Gain (Loss) Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized foreign currency translation gains (losses) during period $ 232 $ 286 $ 283
Derivative gains (losses) (224) (109) (255)
Derivative and non-derivative hedging instruments gain (loss) recognized in other comprehensive income effective portion before tax [1] (38) (34) (42)
Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) [2] 0 0 1
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 3 1 3
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
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] 3 1 3
Fair value hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) (112) (169) (384)
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1] (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) [3] (116) (180) (359)
Fair value hedges | Foreign currency options      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) [3] 4 11 (25)
Fair value hedges | Interest rate swaptions      
Derivative Instruments, Gain (Loss) [Line Items]      
Net Realized Investment Gains (Losses) Recognized in Income on Derivative (Ineffective Portion) [3] 0 0 0
Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) [1],[3] (1) 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] (40) (35) (45)
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] 0 (25) (118)
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] (8) 5 73
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] (32) (15) 0
Non-qualifying strategies      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net (112) 60 128
Non-qualifying strategies | Foreign currency swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 20 53 117
Non-qualifying strategies | Foreign currency forwards      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net (135) 8 9
Non-qualifying strategies | Credit default swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net 0 (1) 2
Non-qualifying strategies | Interest rate swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Recognized in Income, Net $ 3 $ 0 $ 0
[1] Cash flow hedge items and the change in the fair value of interest rate swaptions related to the time value of the swaptions in fair value hedges 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 of cash flow hedges reported as realized investment gains (losses) includes an immaterial amount of gains or losses reclassified from accumulated other comprehensive income (loss) into earnings. It also includes an immaterial amount excluded from effectiveness testing during the years ended December 31, 2018 and 2017 and $1 million during the year ended December 31, 2016.
[3] Impact shown net of effect of hedged items (see Fair Value Hedges section of this Note 4 for further detail)