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Segment Information (Schedule Of Disaggregation Of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 334 | $ 646
Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 22 | 43
Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 312 | 603
Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 181 | 361
Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 153 | 285
Annuities Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 252 | 505
Annuities Segment [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 18 | 36
Annuities Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 234 | 469
Annuities Segment [Member] | Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 133 | 266
Annuities Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 119 | 239
Retirement Plan Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 47 | 93
Retirement Plan Services Segment [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 2 | 3
Retirement Plan Services Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 45 | 90
Retirement Plan Services Segment [Member] | Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 42 | 84
Retirement Plan Services Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 5 | 9
Life Insurance Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 8 | 16
Life Insurance Segment [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 2 | 4
Life Insurance Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 6 | 12
Life Insurance Segment [Member] | Fee Income [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 6 | 11
Life Insurance Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 2 | 5
Group Protection Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 27 | 32
Group Protection Segment [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 27 | 32
Group Protection Segment [Member] | Other Revenues [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 27 | $ 32

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