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Contingencies And Commitments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |
Proceeds from sales leaseback transaction | $ 62 | $ 85 | $ 47
Total rental expense on operating leases | 43 | 44 | $ 42
Total accumulated amortization related to sales leaseback transaction | 101 | 92 |
Loss contingency accrual, insurance-related assessment, premium tax offset | (16) | $ (9) |
Football Stadium Naming Rights Commitment [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Amount of commitment, total | $ 140 |  |
Time period of commitment | 20 years |  |
Approximate Amount Of Commitment Per Year | $ 7 |  |
Variable Annuity Product Concentration Risk [Member] | Variable Annuity Deposits Total [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Concentration risk, percentage | 14.00% | 21.00% | 18.00%
Variable Annuity Product Concentration Risk [Member] | Variable Annuity Account Values Total [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Concentration risk, percentage | 40.00% | 41.00% | 42.00%
Fund Choice Concentration Risk [Member] | Variable Annuity Deposits Total [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Concentration risk, percentage | 20.00% | 23.00% | 20.00%
Fund Choice Concentration Risk [Member] | Variable Annuity Account Values Total [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Concentration risk, percentage | 47.00% | 47.00% | 48.00%
Maximum [Member] | Pending Litigation [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss contingency, estimate | $ 50 |  |

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