Quarterly Results of Operations (Unaudited) (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2016 |
Dec. 31, 2016 |
|
| Universal Life | ||
| Error Corrections and Prior Period Adjustments Restatement [Line Items] | ||
| Out of period decrease adjustments | $ (148) | $ (141) |
| Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures | ||
| Error Corrections and Prior Period Adjustments Restatement [Line Items] | ||
| Out of period decrease adjustments | $ (153) | $ (134) |