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Fair Value of Financial Instruments (Fair Value of Assets and Liabilities on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | $ 230,091 | $ 224,673
Liabilities measured at fair value |  | (3,223) | (4,397)
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 |  | 1,730 | 1,596
Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 224,451 | 219,330
Liabilities measured at fair value |  | (1,537) | (2,195)
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,910 | 3,747
Liabilities measured at fair value |  | (1,686) | (2,202)
Corporate bonds [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 78,779 | 77,064
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 |  | 76,376 | 74,659
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 |  | 2,403 | 2,405
ABS [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,062 | 1,085
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 |  | 1,033 | 1,052
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 |  | 29 | 33
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 |  | 576 | 419
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 |  | 562 | 408
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 |  | 9 | 11
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 |  | 456 | 506
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 |  | 346 | 395
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 |  | 110 | 111
RMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,581 | 3,614
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 |  | 3,574 | 3,611
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 | 3
CMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 427 | 350
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 |  | 383 | 343
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 |  | 44 | 7
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 776 | 744
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 |  | 688 | 676
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 |  | 88 | 68
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 |  | 4,826 | 4,627
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 |  | 4,825 | 4,627
State and municipal 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 |  | 1 |
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 |  | 619 | 604
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 |  | 66 | 60
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 |  | 474 | 468
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 |  | 79 | 76
VIEs' fixed maturity securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 200
VIEs' fixed maturity securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  |  | 200
Equity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 276 | 275
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 |  | 16 | 17
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 |  | 78 | 81
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 |  | 182 | 177
Trading securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,703 | 1,712
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 |  | 102 | 102
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 |  | 1,541 | 1,545
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 |  | 60 | 65
Derivative investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 1,637 | 2,005
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] | 1,077 | 1,406
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] | 560 | 599
Other investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 150 | 146
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 |  | 150 | 146
Invested cash [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,923 | 2,722
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 |  | 1,923 | 2,722
GLB ceded embedded derivatives [Member] | Other assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 116 | 203
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 |  | 116 | 203
Separate Account Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 132,958 | 128,397
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 |  | 834 | 863
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 |  | 132,124 | 127,534
Indexed annuity and IUL contracts embedded derivatives [Member] | Future contract benefits [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (1,238) | (1,139)
Indexed annuity and IUL contracts 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 |  | (1,238) | (1,139)
Long-term Debt [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (1,118) | (1,203)
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 |  | (1,118) | (1,203)
Reinsurance related embedded derivatives [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (50) | (53)
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 |  | (50) | (53)
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] | (817) | (1,631)
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] | (369) | (939)
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] | (448) | (692)
GLB direct embedded derivatives [Member] | Other assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 226 |
GLB direct embedded derivatives [Member] | Other liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  |  | (371)
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 |  | $ 226 |
GLB direct 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 |  |  | $ (371)
[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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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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