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Investments (OTTI rollforward) (Details 6) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
OTTI Recognized in Earnings        
Beginning balance $ 70 $ 81 $ 69 $ 85
Credit losses for which an other-than-temporary impairment was not previously recognized 0 0 0 1
Credit losses for which an other-than-temporary impairment was previously recognized 0 0 1 0
Reductions for securities sold during the period (realized) (68) 0 (68) (5)
Ending balance $ 2 $ 81 $ 2 $ 81