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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | $ 225 | $ 268 | $ 351 | $ 443
Sales | (32) | (52) | 181 | (86)
Maturities | (124) | (31) | (236) | (48)
Settlements | (17) | (14) | (42) | (24)
Calls | (13) |  | (108) | (57)
Total | 39 | 171 | 146 | 228
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 | 172 | 200 | 289
Sales | (3) | (8) | (65) |
Maturities | (25) |  | (47) | (3)
Settlements | (64) | (46) | (127) | (83)
Calls | (13) |  | (108) | (57)
Total | 57 | 118 | (147) | 146
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 |  | 15
Settlements |  | (1) |  | (1)
Total |  | 14 |  | 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 |  | 10 |  | 10
Total |  | 10 |  | 10
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 |  | 15 | 4 | 15
Total |  | 15 | 4 | 15
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 | 14 |  | 55 |
Sales |  | (1) |  | (1)
Settlements |  | (1) |  | (2)
Total | 14 | (2) | 55 | (3)
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 | 13 | 40 | 18 | 80
Settlements |  |  |  | (2)
Total | 13 | 40 | 18 | 78
Equity AFS securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 1 |  | 8 | 4
Sales |  |  | (2) |
Total | 1 |  | 6 | 4
Trading securities [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances |  |  | 2 |
Sales |  |  | (17) |
Settlements |  |  | (1) | (1)
Total |  |  | (16) | (1)
Derivative investments [Member] |  |  |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract] |  |  |  |
Issuances | 48 | 45 | 95 | 85
Sales | (29) | (43) | 265 | (85)
Maturities | (99) | (31) | (189) | (45)
Total | (80) | (29) | 171 | (45)
Indexed annuity and IUL contracts 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 | (13) | (19) | (31) | (45)
Settlements | 47 | 24 | 86 | 55
Total | $ 34 | $ 5 | $ 55 | $ 10

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- Definition Represents decreases to the amount of certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments) due to calls of investments during the period. The alternative investments represented by this item are subject to significant unobservable inputs (Level 3) for purposes of measuring fair value. + References No definition available. + Details
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