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Segment Information (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 353 | $ 999
Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 21 | 62
Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 332 | 937
Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 185 | 546
Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 168 | 453
Annuities Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 257 | 762
Annuities Segment [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 17 | 53
Annuities Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 240 | 709
Annuities Segment [Member] | Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 137 | 403
Annuities Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 120 | 359
Retirement Plan Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 47 | 140
Retirement Plan Services Segment [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 1 | 3
Retirement Plan Services Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 46 | 137
Retirement Plan Services Segment [Member] | Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 42 | 126
Retirement Plan Services Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 5 | 14
Life Insurance Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 8 | 24
Life Insurance Segment [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 3 | 6
Life Insurance Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 5 | 18
Life Insurance Segment [Member] | Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 6 | 17
Life Insurance Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 2 | 7
Group Protection Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 41 | 73
Group Protection Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 41 | 73
Group Protection Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 41 | $ 73

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