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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | $ 230 | $ 237 | $ 1,118 | $ 588
Sales | 455 | (148) | 257 | 34
Maturities | (121) | (131) | (357) | (367)
Settlements | 11 | (33) | (60) | (76)
Calls | (8) | (26) | (69) | (134)
Total | 567 | (101) | 889 | 45
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 162 | 167 | 785 | 367
Sales |  | (114) | (156) | (179)
Maturities | (1) | (19) | (3) | (66)
Settlements | (65) | (43) | (238) | (170)
Calls | (8) | (26) | (69) | (134)
Total | 88 | (35) | 319 | (182)
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances |  |  | 22 |
Sales |  |  | (17) |
Total |  |  | 5 |
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Sales |  |  | (5) |
Total |  |  | (5) |
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 7 | 6 | 7 | 10
Total | 7 | 6 | 7 | 10
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 18 |  | 39 | 55
Settlements |  | (1) | (2) | (1)
Total | 18 | (1) | 37 | 54
CLOs [Member] | Fixed Maturity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 17 | 15 | 164 | 33
Total | 17 | 15 | 164 | 33
Equity AFS Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances |  | 10 |  | 18
Sales |  | (1) |  | (3)
Total |  | 9 |  | 15
Trading Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 2 |  | 4 | 2
Sales |  | (10) | (24) | (27)
Settlements |  |  |  | (1)
Total | 2 | (10) | (20) | (26)
Equity Securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances |  |  | 1 |
Sales |  |  | (1) |
Derivative Investments [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 96 | 50 | 225 | 145
Sales | 455 | (23) | 460 | 243
Maturities | (120) | (112) | (354) | (301)
Total | 431 | (85) | 331 | 87
Indexed Annuity And Embedded Derivatives [Member] | Other Assets [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 11 | 3 | 29 | 3
Total | 11 | 3 | 29 | 3
Indexed Annuity And Embedded Derivatives [Member] | Future Contract Benefits [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | (83) | (14) | (158) | (45)
Settlements | 76 | 11 | 180 | 96
Total | $ (7) | $ (3) | $ 22 | $ 51

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