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Fair Value of Financial Instruments (Fair Value Measured On A Recurring Basis Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value |  | $ 1,545 |  | $ 1,799 | $ 2,547 |
Items Included in Net Income |  | 650 |  | (73) | (795) |
Gains (Losses) in OCI and Other |  | 347 |  | (42) | (173) | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net |  | 410 |  | 245 | 132 |
Transfers In or Out of Level 3, Net | [2] | 187 |  | (384) | 88 |
Ending Fair Value |  | 3,139 |  | 1,545 | 1,799 |
Corporate Bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 2,405 |  | 1,993 | 1,953 |
Items Included in Net Income | [3] | 19 |  | 4 | 4 |
Gains (Losses) in OCI and Other | [3] | 198 |  | (31) | (140) | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | 99 |  | 58 | 118 |
Transfers In or Out of Level 3, Net | [2],[3] | 370 |  | 381 | 58 |
Ending Fair Value | [3] | 3,091 |  | 2,405 | 1,993 |
ABS [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 33 |  | 45 | 33 |
Gains (Losses) in OCI and Other | [3] | (1) |  | (2) |  |
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] |  |  | 14 | 12 |
Transfers In or Out of Level 3, Net | [2],[3] | (5) |  | (24) |  |
Ending Fair Value | [3] | 27 |  | 33 | 45 |
U.S. government bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Issuances, Sales, Maturities, Settlements, Calls, Net |  |  |  | 8 |  |
Transfers In or Out of Level 3, Net | [2] | 5 |  | (8) |  |
Ending Fair Value |  | 5 |  |  |  |
Foreign Government Bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 111 |  | 111 | 109 |
Items Included in Net Income | [3] |  |  |  |  |
Gains (Losses) in OCI and Other | [3] | (1) |  |  | 2 | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] |  |  |  |  |
Transfers In or Out of Level 3, Net | [2],[3] |  |  |  |  |
Ending Fair Value | [3] | 110 |  | 111 | 111 |
RMBS [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 3 |  | 1 | 1 |
Items Included in Net Income | [3] |  |  |  | 4 |
Gains (Losses) in OCI and Other | [3] |  |  |  |  | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | 20 |  | 66 | (4) |
Transfers In or Out of Level 3, Net | [2],[3] | (11) |  | (64) |  |
Ending Fair Value | [3] | 12 |  | 3 | 1 |
CMBS [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 7 |  | 10 | 15 |
Items Included in Net Income | [3] |  |  | 2 | 2 |
Gains (Losses) in OCI and Other | [3] | 1 |  | (1) | 8 | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | 54 |  | 27 | (15) |
Transfers In or Out of Level 3, Net | [2],[3] | (56) |  | (31) |  |
Ending Fair Value | [3] | 6 |  | 7 | 10 |
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 68 |  | 551 | 368 |
Gains (Losses) in OCI and Other | [1],[3] |  |  |  | 1 |
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | 124 |  | 138 | 194 |
Transfers In or Out of Level 3, Net | [2],[3] | (101) |  | (621) | (12) |
Ending Fair Value | [3] | 91 |  | 68 | 551 |
State and municipal bonds [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Items Included in Net Income |  | (1) |  |  |  |
Transfers In or Out of Level 3, Net | [2] | 1 |  |  |  |
Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 76 |  | 94 | 55 |
Items Included in Net Income | [3] |  |  |  | (1) |
Gains (Losses) in OCI and Other | [3] | 15 |  | (3) | (3) | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | (1) |  | (15) |  |
Transfers In or Out of Level 3, Net | [2],[3] | (14) |  |  | 43 |
Ending Fair Value | [3] | 76 |  | 76 | 94 |
Equity AFS securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 177 |  | 164 | 157 |
Items Included in Net Income | [3] | 1 |  | 5 | 2 |
Gains (Losses) in OCI and Other | [3] | (2) |  | (4) | 3 | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | (13) |  | 12 | 3 |
Transfers In or Out of Level 3, Net | [2],[3] | (1) |  |  | (1) |
Ending Fair Value | [3] | 162 |  | 177 | 164 |
Trading securities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | 65 |  | 73 | 73 |
Items Included in Net Income | [3] | 3 |  | 4 | 3 |
Gains (Losses) in OCI and Other | [3] | 8 |  |  | (3) | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | (26) |  | 5 |  |
Transfers In or Out of Level 3, Net | [2],[3] | (1) |  | (17) |  |
Ending Fair Value | [3] | 49 |  | 65 | 73 |
Derivative investments [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [3] | (93) |  | 555 | 989 |
Items Included in Net Income | [3] | (27) |  | (483) | (90) |
Gains (Losses) in OCI and Other | [3] | 129 |  | (1) | (41) | [1]
Issuances, Sales, Maturities, Settlements, Calls, Net | [3] | 21 |  | (164) | (303) |
Ending Fair Value | [3] | 30 |  | (93) | 555 |
GLB Direct Embedded Derivatives [Member] | Other assets [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Items Included in Net Income | [4] | 903 |  |  |  |
Ending Fair Value | [4] | 903 |  |  |  |
GLB Direct Embedded Derivatives [Member] | Other liabilities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [4] | (371) |  | (953) | (174) |
Items Included in Net Income |  | 371 | [4] | 582 | (779) | [4]
Ending Fair Value | [4] |  |  | (371) | (953) |
GLB Ceded Embedded Derivatives [Member] | Other assets [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [4] | 203 |  | 268 | 154 |
Items Included in Net Income | [4] | (152) |  | (65) | 114 |
Ending Fair Value | [4] | 51 |  | 203 | 268 |
GLB Ceded Embedded Derivatives [Member] | Other liabilities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Items Included in Net Income | [4] | (67) |  |  |  |
Ending Fair Value | [4] | (67) |  |  |  |
Indexed annuity and embedded derivatives [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Issuances, Sales, Maturities, Settlements, Calls, Net | [4] | 11 |  |  |  |
Ending Fair Value | [4] | 11 |  |  |  |
Indexed annuity and embedded derivatives [Member] | Future contract benefits [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [4] | (1,139) |  | (1,100) | (1,170) |
Items Included in Net Income | [4] | (400) |  | (120) | (57) |
Issuances, Sales, Maturities, Settlements, Calls, Net | [4] | 121 |  | 81 | 127 |
Ending Fair Value | [4] | $ (1,418) |  | (1,139) | (1,100) |
VIEs' liabilities - derivative instruments [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [5] |  |  | (4) | (13) |
Items Included in Net Income | [5] |  |  | 4 | 9 |
Ending Fair Value | [5] |  |  |  | (4) |
Credit Default Swaps [Member] | Other liabilities [Member] |  |  |  |  |  |
Level 3 Unobservable Input Reconciliation |  |  |  |  |  |
Beginning Fair Value | [5] |  |  | (9) | (3) |
Items Included in Net Income | [5] |  |  | (6) | (6) |
Issuances, Sales, Maturities, Settlements, Calls, Net | [5] |  |  | $ 15 |  |
Ending Fair Value | [5] |  |  |  | $ (9) |
[1] | The changes in fair value of the interest rate swaps are offset by an adjustment to derivative investments (see Note 6).
[2] | Transfers into or out of Level 3 for AFS and trading securities are displayed at amortized cost as of the beginning-of-year. For AFS and trading securities, the difference between beginning-of-year amortized cost and beginning-of-year fair value was included in OCI and earnings, respectively, in prior years.
[3] | Amortization and accretion of premiums and discounts are included in net investment income on our Consolidated Statements of Comprehensive Income (Loss). Gains (losses) from sales, maturities, settlements and calls and OTTI are included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).
[4] | Gains (losses) from sales, maturities, settlements and calls are included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).
[5] | The changes in fair value of the credit default swaps and contingency forwards are included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).

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