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Derivatives - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
swap
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
swap
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying value of collateral received to support purchased call options $ 449,000,000   $ 449,000,000   $ 103,000,000
Total realized/unrealized gains (losses) included in net income for the embedded derivatives related to unlocking of actuarial assumptions       $ 44,000,000  
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap 15   15    
Notional amount of derivative instrument outstanding $ 2,140,000,000   $ 2,140,000,000   2,350,000,000
Gain (loss) reclassified from AOCI into net investment income 1,000,000 $ (2,000,000) (1,000,000) (1,000,000)  
Gain (loss) on cash flow hedge ineffectiveness recorded in Net Earnings 0 $ 0 0 $ 0  
Collateral receivable supporting interest rate swaps 76,000,000   76,000,000   135,000,000
Other assets | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value 54,000,000   54,000,000   16,000,000
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives, at fair value (7,000,000)   (7,000,000)   $ (46,000,000)
Contract termination | Cash Flow Hedges | Interest rate swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Notional amount of derivative instrument outstanding $ 138,000,000   $ 138,000,000