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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value Measurement [Domain] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Separate Account Assets | $ 113,585,000,000 |  | $ 111,634,000,000 |
Fair Value Measurement [Domain] | Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Separate Account Assets | 73,539,000,000 |  | 71,606,000,000 |
Fair Value Measurement [Domain] | Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Separate Account Assets | 38,882,000,000 |  | 38,856,000,000 |
Fair Value Measurement [Domain] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Separate Account Assets | 277,000,000 |  | 201,000,000 |
Available-for-sale Securities, Debt Securities | 56,326,000,000 |  | 56,003,000,000 |
Trading Securities, Equity | 11,000,000 |  | 11,000,000 |
Available-for-sale Securities, Equity Securities | 1,223,000,000 |  | 1,097,000,000 |
Short-term investments | 4,595,000,000 |  | 3,244,000,000 |
Alternative Investments, Fair Value Disclosure | 2,418,000,000 |  | 2,456,000,000 |
Reinsurance recoverable for U.S. GMWB | 23,405,000,000 |  | 23,311,000,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 4,491,000,000 | $ 4,184,000,000 | 4,422,000,000 | $ 3,911,000,000
Separate Account Assets | 116,582,000,000 |  | 115,665,000,000 |
Assets, Fair Value Disclosure | 176,276,000,000 |  | 172,243,000,000 |
Marketable Securities, Fixed Maturities | 160,000,000 |  | 293,000,000 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | (902,000,000) |  | (988,000,000) |
Derivative Liability, Fair Value, Amount Offset Against Collateral | 19,000,000 |  | 56,000,000 |
HIG_FairValueAssetsLevel2ToLevel1TransfersAmounts | 0 | 0 |  |
Business Combination, Contingent Consideration, Liability | 60 |  |  |
ABS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 2,265,000,000 |  | 2,382,000,000 |
Collateralized Debt Obligations [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 2,311,000,000 |  | 1,916,000,000 |
CMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 5,099,000,000 |  | 4,936,000,000 |
Corporate [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 25,730,000,000 |  | 25,666,000,000 |
Foreign Government Debt Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,187,000,000 |  | 1,171,000,000 |
Municipal [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 11,780,000,000 |  | 11,486,000,000 |
RMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 3,921,000,000 |  | 4,767,000,000 |
U.S. Treasuries [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 4,033,000,000 |  | 3,679,000,000 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
HIG_FairValueAssetsLevel1ToLevel2TransfersAmount | 0 | 0 |  |
Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 688,000,000 |  | 620,000,000 |
Trading Securities, Equity | 11,000,000 |  | 11,000,000 |
Available-for-sale Securities, Equity Securities | 936,000,000 |  | 821,000,000 |
Short-term investments | 2,077,000,000 |  | 878,000,000 |
Assets, Fair Value Disclosure | 77,251,000,000 |  | 73,937,000,000 |
Marketable Securities, Fixed Maturities | 0 |  | 1,000,000 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | 0 |  | 0 |
Level 1 [Member] | ABS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | CMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | Corporate [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | Municipal [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | RMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Level 1 [Member] | U.S. Treasuries [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 688,000,000 |  | 620,000,000 |
Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 51,768,000,000 |  | 51,573,000,000 |
Trading Securities, Equity | 0 |  | 0 |
Available-for-sale Securities, Equity Securities | 188,000,000 |  | 177,000,000 |
Short-term investments | 2,518,000,000 |  | 2,366,000,000 |
Assets, Fair Value Disclosure | 93,675,000,000 |  | 92,960,000,000 |
Marketable Securities, Fixed Maturities | 160,000,000 |  | 281,000,000 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | (711,000,000) |  | (736,000,000) |
Level 2 [Member] | ABS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 2,140,000,000 |  | 2,300,000,000 |
Level 2 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,992,000,000 |  | 1,502,000,000 |
Level 2 [Member] | CMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 4,982,000,000 |  | 4,856,000,000 |
Level 2 [Member] | Corporate [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 24,652,000,000 |  | 24,586,000,000 |
Level 2 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,121,000,000 |  | 1,107,000,000 |
Level 2 [Member] | Municipal [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 11,663,000,000 |  | 11,368,000,000 |
Level 2 [Member] | RMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,873,000,000 |  | 2,795,000,000 |
Level 2 [Member] | U.S. Treasuries [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 3,345,000,000 |  | 3,059,000,000 |
Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 3,870,000,000 |  | 3,810,000,000 |
Trading Securities, Equity | 0 |  | 0 |
Available-for-sale Securities, Equity Securities | 99,000,000 |  | 99,000,000 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (219,000,000) |  | (299,000,000) | (288,000,000)
Short-term investments | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 277,000,000 | 154,000,000 | 201,000,000 | 139,000,000
Assets, Fair Value Disclosure | 4,463,000,000 |  | 4,375,000,000 |
Marketable Securities, Fixed Maturities | 0 |  | 11,000,000 |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | (191,000,000) |  | (252,000,000) |
Level 3 [Member] | ABS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 125,000,000 |  | 82,000,000 |
Level 3 [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 319,000,000 |  | 414,000,000 |
Level 3 [Member] | CMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 117,000,000 |  | 80,000,000 |
Level 3 [Member] | Corporate [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 1,078,000,000 |  | 1,080,000,000 |
Level 3 [Member] | Foreign Government Debt Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 66,000,000 |  | 64,000,000 |
Level 3 [Member] | Municipal [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 117,000,000 |  | 118,000,000 |
Level 3 [Member] | RMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 2,048,000,000 |  | 1,972,000,000 |
Level 3 [Member] | U.S. Treasuries [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (193,000,000) | (386,000,000) | (274,000,000) | (288,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 76,000,000 |  | 52,000,000 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Debt Securities | 2,038,000,000 |  | 1,963,000,000 |
Liability [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | (193,000,000) |  | (274,000,000) |
Liability [Member] | Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |
Liability [Member] | Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |
Liability [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | (193,000,000) |  | (274,000,000) |
Obligations [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | (26,000,000) |  | (25,000,000) |
Obligations [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | (26,000,000) |  | (25,000,000) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (26,000,000) | (386,000,000) | (25,000,000) |
Equity Linked Notes [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | (36,000,000) |  | (33,000,000) |
Equity Linked Notes [Member] | Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |
Equity Linked Notes [Member] | Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |
Equity Linked Notes [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure |  |  | (33,000,000) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (36,000,000) | (25,000,000) | (33,000,000) | (26,000,000)
US GMWB Hedging Instruments [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 80,000,000 |  | 74,000,000 |
US GMWB Hedging Instruments [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 3,000,000 |  | 20,000,000 |
US GMWB Hedging Instruments [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
US GMWB Hedging Instruments [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 36,000,000 |  | 14,000,000 |
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 1,000,000 |  | (1,000,000) |
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 44,000,000 |  | 60,000,000 |
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 2,000,000 |  | 21,000,000 |
GMWB Reinsurance [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 60,000,000 |  | 73,000,000 |
GMWB Reinsurance [Member] | Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 0 |  | 0 |
GMWB Reinsurance [Member] | Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 0 |  | 0 |
GMWB Reinsurance [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB |  |  | 73,000,000 |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 66,000,000 |  | 68,000,000 |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 0 |  | 0 |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 66,000,000 |  | 68,000,000 |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Reinsurance recoverable for U.S. GMWB | 0 |  | 0 |
Macro Hedge Program [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 113,000,000 |  | 128,000,000 |
Macro Hedge Program [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 58,000,000 |  | 50,000,000 |
Macro Hedge Program [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
Macro Hedge Program [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
Macro Hedge Program [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 9,000,000 |  | 8,000,000 |
Macro Hedge Program [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 3,000,000 |  | 3,000,000 |
Macro Hedge Program [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 104,000,000 |  | 120,000,000 |
Macro Hedge Program [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 55,000,000 |  | 47,000,000 |
ERROR in label resolution. | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 2,000,000 |  | 17,000,000 |
ERROR in label resolution. | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (2,000,000) |  |  |
ERROR in label resolution. | Level 1 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
ERROR in label resolution. | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
ERROR in label resolution. | Level 2 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 2,000,000 |  | 17,000,000 |
ERROR in label resolution. | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (2,000,000) |  |  |
ERROR in label resolution. | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
ERROR in label resolution. | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (13,000,000) |
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (13,000,000) |
ERROR in label resolution. | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
Equity Contract [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 4,000,000 |  |  |
Equity Contract [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 37,000,000 |  |  |
Equity Contract [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
Equity Contract [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
Equity Contract [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
Equity Contract [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 37,000,000 |  |  |
Equity Contract [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 4,000,000 |  |  |
Equity Contract [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 33,000,000 |
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 33,000,000 |
Equity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
Foreign Exchange Contract [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 3,000,000 |  | 27,000,000 |
Foreign Exchange Contract [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (262,000,000) |  |  |
Foreign Exchange Contract [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
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Foreign Exchange Contract [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 3,000,000 |  | 27,000,000 |
Foreign Exchange Contract [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (262,000,000) |  |  |
Foreign Exchange Contract [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (237,000,000) |
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (237,000,000) |
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
Interest Rate Contract [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 48,000,000 |  | (427,000,000) |
Interest Rate Contract [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (517,000,000) |  |  |
Interest Rate Contract [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
Interest Rate Contract [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  |  |
Interest Rate Contract [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 43,000,000 |  | (427,000,000) |
Interest Rate Contract [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (488,000,000) |  |  |
Interest Rate Contract [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 5,000,000 |  | 0 |
Interest Rate Contract [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (29,000,000) |  |  |
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (542,000,000) |
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (521,000,000) |
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | (21,000,000) |
Other Contract [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 1,000,000 |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 0 |
Other Contract [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 76,000,000 |  | 100,000,000 |
Other Contract [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | 1,000,000 |
Derivative Financial Instruments, Assets [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 250,000,000 |  | (180,000,000) |
Derivative Financial Instruments, Assets [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 93,000,000 |  | (361,000,000) |
Derivative Financial Instruments, Assets [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 157,000,000 |  | 181,000,000 |
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (683,000,000) |  | (689,000,000) |
Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |
Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (711,000,000) |  | (736,000,000) |
Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 28,000,000 |  | 47,000,000 |
Guaranteed Minimum Withdrawal Benefit [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure |  |  | (241,000,000) |
Guaranteed Minimum Withdrawal Benefit [Member] | Other policyholder funds and benefits payable [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | (157,000,000) |  |  |
Guaranteed Minimum Withdrawal Benefit [Member] | Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure |  |  | 0 |
Guaranteed Minimum Withdrawal Benefit [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | 0 |  |  |
Guaranteed Minimum Withdrawal Benefit [Member] | Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure |  |  | 0 |
Guaranteed Minimum Withdrawal Benefit [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure | 0 |  |  |
Guaranteed Minimum Withdrawal Benefit [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Obligations, Fair Value Disclosure |  |  | (241,000,000) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 157,000,000 | $ (361,000,000) | (241,000,000) | $ (262,000,000)
Estimate of Fair Value Measurement [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Separate Account Assets | 887,000,000 |  | 1,000,000,000 |
Portion at Other than Fair Value Measurement [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Separate Account Assets | $ 3,000,000,000 |  | $ 4,000,000,000 |
Hedge Funds [Member] | Separate Accounts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage | 42.00% |  | 39.00% |
Private Equity Funds [Member] | Separate Accounts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage | 12.00% |  | 11.00% |
Reinsurance Recoverable [Member] | Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 60,000,000 |  | $ 73,000,000 |

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