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Fair Value of Financial Instruments (Fair Value of Assets and Liabilities on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | $ 246,814 | $ 245,265
Liabilities measured at fair value |  | (2,382) | (3,689)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,449 | 1,692
Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 239,553 | 238,376
Liabilities measured at fair value |  | (437) | (1,631)
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 5,812 | 5,197
Liabilities measured at fair value |  | (1,945) | (2,058)
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 80,080 | 82,216
Corporate Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 76,871 | 79,125
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,209 | 3,091
ABS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 985 | 974
ABS [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 954 | 947
ABS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 31 | 27
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 409 | 567
U.S. Government Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 391 | 556
U.S. Government Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 18 | 6
U.S. Government Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 5
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 459 | 451
Foreign Government Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 351 | 341
Foreign Government Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 108 | 110
RMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,287 | 3,465
RMBS [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,280 | 3,453
RMBS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 7 | 12
CMBS [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 748 | 600
CMBS [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 725 | 594
CMBS [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 23 | 6
CLOs [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,362 | 808
CLOs [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,311 | 717
CLOs [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 51 | 91
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 5,218 | 5,119
State And Municipal Bonds [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 5,218 | 5,119
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 613 | 640
Hybrid And Redeemable Preferred Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 74 | 71
Hybrid And Redeemable Preferred Securities [Member] | Significant Observable Inputs (Level 2) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 462 | 493
Hybrid And Redeemable Preferred Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 77 | 76
Equity AFS Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 246
Equity AFS Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 28
Equity AFS Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 56
Equity AFS Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 162
Trading Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,440 | 1,620
Trading Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 43 | 73
Trading Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,379 | 1,498
Trading Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 18 | 49
Equity Securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 112 |
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 28 |
Equity Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 58 |
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 26 |
Derivative Investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 1,107 | 1,597
Derivative Investments [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 572 | 994
Derivative Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 535 | 603
Other investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 149 | 150
Other investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 149 | 150
Cash And Invested cash [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,460 | 1,628
Cash And Invested cash [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,460 | 1,628
GLB Direct Embedded Derivatives [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,648 | 903
GLB Direct Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,648 | 903
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 35 | 51
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (193) | (67)
GLB Ceded Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 35 | 51
GLB Ceded Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (193) | (67)
Separate Account Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 147,658 | 144,219
Separate Account Assets [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 764 | 814
Separate Account Assets [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 146,894 | 143,405
Indexed Annuity And Embedded Derivatives [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 44 | 11
Indexed Annuity And Embedded Derivatives [Member] | Future Contract Benefits [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (1,571) | (1,418)
Indexed Annuity And Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 44 | 11
Indexed Annuity And Embedded Derivatives [Member] | Significant Unobservable Inputs (Level 3) [Member] | Future Contract Benefits [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (1,571) | (1,418)
Long-term Debt [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  |  | (1,127)
Long-term Debt [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  |  | (1,127)
Reinsurance Related Embedded Derivatives [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (20) | (57)
Reinsurance Related Embedded Derivatives [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (20) | (57)
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value | [1] | (598) | (1,020)
Derivative Financial Instruments, Liabilities [Member] | Significant Observable Inputs (Level 2) [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value | [1] | (417) | (447)
Derivative Financial Instruments, Liabilities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value | [1] | $ (181) | $ (573)
[1] | Derivative investment assets and liabilities presented within the fair value hierarchy are presented on a gross basis by derivative type and not on a master netting basis by counterparty.

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