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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | $ 237 | $ 250 | $ 588 | $ 692
Sales | (148) | (55) | 34 | (143)
Maturities | (131) | (88) | (367) | (136)
Settlements | (33) |  | (76) | (22)
Calls | (26) | (78) | (134) | (135)
Total | (101) | 29 | 45 | 256
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 | 167 | 92 | 367 | 381
Sales | (114) | (20) | (179) | (19)
Maturities | (19) | (18) | (66) | (22)
Settlements | (43) | (50) | (170) | (133)
Calls | (26) | (78) | (134) | (135)
Total | (35) | (74) | (182) | 72
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 |  |  |  | 15
Settlements |  |  |  | (1)
Total |  |  |  | 14
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] |  |  |  |
Settlements |  | (2) |  | 8
Total |  | (2) |  | 8
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 | 6 | 51 | 10 | 66
Total | 6 | 51 | 10 | 66
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 |  | 31 | 55 | 31
Sales |  |  |  | (2)
Settlements | (1) | (1) | (1) | (2)
Total | (1) | 30 | 54 | 27
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 | 15 | 35 | 33 | 115
Settlements |  |  |  | (2)
Total | 15 | 35 | 33 | 113
Equity AFS securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 10 |  | 18 | 4
Sales | (1) | (4) | (3) | (4)
Total | 9 | (4) | 15 |
Trading securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances |  | 7 | 2 | 6
Sales | (10) |  | (27) |
Settlements |  | (1) | (1) | (1)
Total | (10) | 6 | (26) | 5
Derivative investments [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 50 | 47 | 145 | 132
Sales | (23) | (46) | 243 | (133)
Maturities | (112) | (70) | (301) | (114)
Total | (85) | (69) | 87 | (115)
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 | 3 |  | 3 |
Total | 3 |  | 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 | (14) | (13) | (45) | (58)
Settlements | 11 | 54 | 96 | 109
Total | $ (3) | 41 | $ 51 | 51
Credit default swaps [Member] | Other liabilities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Sales |  | 15 |  | 15
Total |  | $ 15 |  | $ 15

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