Segment Information (Narrative) (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
USD ($)
segment
division
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
| Segment Reporting Information [Line Items] | |||
| Number of divisions | division | 5 | ||
| Number of Reportable Segments | segment | 7 | ||
| Total deferred gain (loss) | $ 80 | ||
| Synthetic Gic Fees | 159 | $ 158 | $ 158 |
| Asset management and service fees | 4,127 | 3,752 | 3,772 |
| Segment Reconciling Items | |||
| Segment Reporting Information [Line Items] | |||
| Derivative, Gain (Loss) on Derivative, Net, Terminated Or Offset Before Maturity | 53 | 49 | $ 55 |
| Individual Life | |||
| Segment Reporting Information [Line Items] | |||
| Out of period decrease adjustments | (153) | ||
| Included In Operating Measure | |||
| Segment Reporting Information [Line Items] | |||
| Out of period decrease adjustments | $ (114) | ||
| Domestic subsidiaries | |||
| Segment Reporting Information [Line Items] | |||
| Asset management and service fees | 56 | ||
| Foreign subsidiaries | |||
| Segment Reporting Information [Line Items] | |||
| Asset management and service fees | $ 19 | ||