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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fixed income securities $ 21,752   $ 21,752   $ 23,261
Fair value, assets and liabilities gain (loss) included in earnings (3) $ (6) 27 $ 11  
Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets, fair value disclosure 419   419   467
Recurring basis | Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fixed income securities 297   297   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 157   157   $ 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 (3) (9) 29 3  
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 3 (3) 10    
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 (8) (4) 12 (10)  
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 2 (4) 7 4  
(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   $ 9  
Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Commitments to invest in limited partnership interests $ 313   $ 313    
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