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Fair Value of Financial Instruments (Fair Value of Assets and Liabilities on a Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | $ 235,024 | $ 224,673
Liabilities measured at fair value |  | (3,292) | (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 |  | 1,639 | 1,596
Significant Observable Inputs (Level 2) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 229,377 | 219,330
Liabilities measured at fair value |  | (1,608) | (2,195)
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 4,008 | 3,747
Liabilities measured at fair value |  | (1,684) | (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 |  | 80,548 | 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 |  | 78,031 | 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 |  | 2,517 | 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 |  | 1,050 | 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 |  | 1,007 | 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 |  | 43 | 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 |  | 578 | 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 |  | 564 | 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 |  | 455 | 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 |  | 109 | 111
RMBS [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 3,552 | 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 |  | 3,545 | 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 |  | 476 | 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 |  | 455 | 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 |  | 21 | 7
CLOs [Member] | Fixed maturity AFS securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 703 | 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 |  | 675 | 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 |  | 28 | 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 |  | 5,010 | 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 |  | 5,010 | 4,627
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 |  | 642 | 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 |  | 67 | 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 |  | 493 | 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 |  | 82 | 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 |  | 275 | 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 |  | 13 | 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 |  | 79 | 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 |  | 183 | 177
Trading securities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 1,678 | 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 |  | 73 | 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 |  | 1,546 | 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 |  | 59 | 65
Derivative investments [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value | [1] | 1,721 | 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] | 1,150 | 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] | 571 | 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 |  | 1,978 | 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 |  | 1,978 | 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 |  | 85 | 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 |  | 85 | 203
Separate Account Assets [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Assets measured at fair value |  | 135,825 | 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 |  | 772 | 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 |  | 135,053 | 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 |  | (1,268) | (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 |  | (1,268) | (1,139)
Long-term Debt [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (1,135) | (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 |  | (1,135) | (1,203)
Reinsurance related embedded derivatives [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |
Liabilities measured at fair value |  | (53) | (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 |  | (53) | (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] | (836) | (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] | (420) | (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] | (416) | (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 |  | 298 |
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 |  | $ 298 |
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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