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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value, assets and liabilities gain (loss) included in earnings $ 6 $ 9 $ 30 $ 17  
Fixed income securities 21,567   21,567   $ 23,261
Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets, fair value disclosure 462   462   467
Recurring basis | Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fixed income securities 348   348   376
Fixed Income Securities Valued Based on Nonbinding Broker Quotes | Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets, fair value disclosure 204   204   $ 237
Gain (loss) on investments          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value, assets and liabilities gain (loss) included in earnings 8 4 32 12  
Realized capital gains and losses          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 6 2 7 3  
Interest credited to contractholder funds          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 1 (1) 20 (6)  
Contract benefits          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 1 1 5 8  
(Loss) gain reclassified from AOCI into income (net investment income)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date   $ 2   $ 7  
Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Commitments to invest in limited partnership interests $ 352   $ 352    
Minimum | Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Investment assets, useful life     10 years    
Maximum | Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Investment assets, useful life     12 years