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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Fair Value Measurement [Domain] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Separate Account Assets | $ 112,559,000,000 |  | $ 112,559,000,000 |  |  | $ 111,634,000,000 |  |
Fair Value Measurement [Domain] | Level 1 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Separate Account Assets | 73,019,000,000 |  | 73,019,000,000 |  |  | 71,606,000,000 |  |
Fair Value Measurement [Domain] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Separate Account Assets | 38,466,000,000 |  | 38,466,000,000 |  |  | 38,856,000,000 |  |
Fair Value Measurement [Domain] | Level 3 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Separate Account Assets | 192,000,000 |  | 192,000,000 |  |  | 201,000,000 |  |
Available-for-sale Securities, Debt Securities | 57,834,000,000 |  | 57,834,000,000 |  |  | 56,003,000,000 |  |
Trading Securities, Equity | 11,000,000 |  | 11,000,000 |  |  | 11,000,000 |  |
Available-for-sale Securities, Equity Securities | 1,055,000,000 |  | 1,055,000,000 |  |  | 1,097,000,000 |  |
Short-term investments | 4,716,000,000 |  | 4,716,000,000 |  |  | 3,244,000,000 |  |
Alternative Investments, Fair Value Disclosure | 2,445,000,000 |  | 2,445,000,000 |  |  | 2,456,000,000 |  |
Reinsurance recoverable for U.S. GMWB | 23,265,000,000 |  | 23,265,000,000 |  |  | 23,311,000,000 |  |
Separate Account Assets | 116,746,000,000 |  | 116,746,000,000 |  |  | 115,665,000,000 |  |
Assets, Fair Value Disclosure | 176,587,000,000 |  | 176,587,000,000 |  |  | 172,243,000,000 |  |
Marketable Securities, Fixed Maturities | 146,000,000 |  | 146,000,000 |  |  | 293,000,000 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | (807,000,000) |  | (807,000,000) |  |  | (988,000,000) |  |
Derivative Liability, Fair Value, Amount Offset Against Collateral | 12,000,000 |  | 12,000,000 |  |  | 56,000,000 |  |
HIG_FairValueAssetsLevel2ToLevel1TransfersAmounts | 0 | $ 0 | 0 | $ 0 |  |  |  |
Business Combination, Contingent Consideration, Liability | 60 |  | 60 |  |  |  |  |
ABS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 2,354,000,000 |  | 2,354,000,000 |  |  | 2,382,000,000 |  |
Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 2,457,000,000 |  | 2,457,000,000 |  |  | 1,916,000,000 |  |
CMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 5,173,000,000 |  | 5,173,000,000 |  |  | 4,936,000,000 |  |
Corporate [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 26,044,000,000 |  | 26,044,000,000 |  |  | 25,666,000,000 |  |
Foreign Government Debt Securities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 1,297,000,000 |  | 1,297,000,000 |  |  | 1,171,000,000 |  |
Municipal [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 12,284,000,000 |  | 12,284,000,000 |  |  | 11,486,000,000 |  |
RMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 4,219,000,000 |  | 4,219,000,000 |  |  | 4,767,000,000 |  |
U.S. Treasuries [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 4,006,000,000 |  | 4,006,000,000 |  |  | 3,679,000,000 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
HIG_FairValueAssetsLevel1ToLevel2TransfersAmount | 692,000,000 | 67,000,000 | 1,300,000,000 | 808,000,000 |  |  |  |
Level 1 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 463,000,000 |  | 463,000,000 |  |  | 620,000,000 |  |
Trading Securities, Equity | 11,000,000 |  | 11,000,000 |  |  | 11,000,000 |  |
Available-for-sale Securities, Equity Securities | 789,000,000 |  | 789,000,000 |  |  | 821,000,000 |  |
Short-term investments | 1,916,000,000 |  | 1,916,000,000 |  |  | 878,000,000 |  |
Assets, Fair Value Disclosure | 76,198,000,000 |  | 76,198,000,000 |  |  | 73,937,000,000 |  |
Marketable Securities, Fixed Maturities | 0 |  | 0 |  |  | 1,000,000 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | ABS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | CMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | Corporate [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | Municipal [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | RMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Level 1 [Member] | U.S. Treasuries [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 463,000,000 |  | 463,000,000 |  |  | 620,000,000 |  |
Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 53,576,000,000 |  | 53,576,000,000 |  |  | 51,573,000,000 |  |
Trading Securities, Equity | 0 |  | 0 |  |  | 0 |  |
Available-for-sale Securities, Equity Securities | 168,000,000 |  | 168,000,000 |  |  | 177,000,000 |  |
Short-term investments | 2,800,000,000 |  | 2,800,000,000 |  |  | 2,366,000,000 |  |
Assets, Fair Value Disclosure | 95,233,000,000 |  | 95,233,000,000 |  |  | 92,960,000,000 |  |
Marketable Securities, Fixed Maturities | 146,000,000 |  | 146,000,000 |  |  | 281,000,000 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | (653,000,000) |  | (653,000,000) |  |  | (736,000,000) |  |
Level 2 [Member] | ABS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 2,258,000,000 |  | 2,258,000,000 |  |  | 2,300,000,000 |  |
Level 2 [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 2,118,000,000 |  | 2,118,000,000 |  |  | 1,502,000,000 |  |
Level 2 [Member] | CMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 5,075,000,000 |  | 5,075,000,000 |  |  | 4,856,000,000 |  |
Level 2 [Member] | Corporate [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 24,908,000,000 |  | 24,908,000,000 |  |  | 24,586,000,000 |  |
Level 2 [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 1,268,000,000 |  | 1,268,000,000 |  |  | 1,107,000,000 |  |
Level 2 [Member] | Municipal [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 12,198,000,000 |  | 12,198,000,000 |  |  | 11,368,000,000 |  |
Level 2 [Member] | RMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 2,208,000,000 |  | 2,208,000,000 |  |  | 2,795,000,000 |  |
Level 2 [Member] | U.S. Treasuries [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 3,543,000,000 |  | 3,543,000,000 |  |  | 3,059,000,000 |  |
Level 3 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 3,795,000,000 |  | 3,795,000,000 |  |  | 3,810,000,000 |  |
Trading Securities, Equity | 0 |  | 0 |  |  | 0 |  |
Available-for-sale Securities, Equity Securities | 98,000,000 |  | 98,000,000 |  |  | 99,000,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (198,000,000) | (440,000,000) | (198,000,000) | (440,000,000) | $ (219,000,000) | (299,000,000) | $ (386,000,000) | $ (288,000,000)
Short-term investments | 0 |  | 0 |  |  | 0 |  |
Assets, Fair Value Disclosure | 4,274,000,000 |  | 4,274,000,000 |  |  | 4,375,000,000 |  |
Marketable Securities, Fixed Maturities | 0 |  | 0 |  |  | 11,000,000 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Total liabilities accounted for at fair value on a recurring basis | (154,000,000) |  | (154,000,000) |  |  | (252,000,000) |  |
Level 3 [Member] | ABS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 96,000,000 |  | 96,000,000 |  |  | 82,000,000 |  |
Level 3 [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 339,000,000 |  | 339,000,000 |  |  | 414,000,000 |  |
Level 3 [Member] | CMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 98,000,000 |  | 98,000,000 |  |  | 80,000,000 |  |
Level 3 [Member] | Corporate [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 1,136,000,000 |  | 1,136,000,000 |  |  | 1,080,000,000 |  |
Level 3 [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 29,000,000 |  | 29,000,000 |  |  | 64,000,000 |  |
Level 3 [Member] | Municipal [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 86,000,000 |  | 86,000,000 |  |  | 118,000,000 |  |
Level 3 [Member] | RMBS [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 2,011,000,000 |  | 2,011,000,000 |  |  | 1,972,000,000 |  |
Level 3 [Member] | U.S. Treasuries [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities | 0 |  | 0 |  |  | 0 |  |
Liability [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | (171,000,000) |  | (171,000,000) |  |  | (274,000,000) |  |
Liability [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |  |  | 0 |  |
Liability [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |  |  | 0 |  |
Liability [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | (171,000,000) |  | (171,000,000) |  |  | (274,000,000) |  |
Obligations [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | (27,000,000) |  | (27,000,000) |  |  | (25,000,000) |  |
Obligations [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | (27,000,000) |  | (27,000,000) |  |  | (25,000,000) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (27,000,000) |  | (27,000,000) |  | (26,000,000) | (25,000,000) |  |
Equity Linked Notes [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | (37,000,000) |  | (37,000,000) |  |  | (33,000,000) |  |
Equity Linked Notes [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 0 |  |  | 0 |  |
Equity Linked Notes [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Obligations, Fair Value Disclosure | 0 |  | 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 | (37,000,000) | (28,000,000) | (37,000,000) | (28,000,000) | (36,000,000) | (33,000,000) | (25,000,000) | (26,000,000)
US GMWB Hedging Instruments [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 45,000,000 |  | 45,000,000 |  |  | 74,000,000 |  |
US GMWB Hedging Instruments [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 40,000,000 |  | 40,000,000 |  |  | 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 |  |  | 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 |  |  | 0 |  |
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 0 |  | 0 |  |  | 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 | 45,000,000 |  | 45,000,000 |  |  | (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 | 45,000,000 |  | 45,000,000 |  |  | 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 | (5,000,000) |  | (5,000,000) |  |  | 21,000,000 |  |
GMWB Reinsurance [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Reinsurance recoverable for U.S. GMWB | 57,000,000 |  | 57,000,000 |  |  | 73,000,000 |  |
GMWB Reinsurance [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Reinsurance recoverable for U.S. GMWB | 0 |  | 0 |  |  | 0 |  |
GMWB Reinsurance [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Reinsurance recoverable for U.S. GMWB | 0 |  | 0 |  |  | 0 |  |
GMWB Reinsurance [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Reinsurance recoverable for U.S. GMWB | 57,000,000 |  | 57,000,000 |  |  | 73,000,000 |  |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Reinsurance recoverable for U.S. GMWB | 58,000,000 |  | 58,000,000 |  |  | 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 |  |  | 0 |  |
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Reinsurance recoverable for U.S. GMWB | 58,000,000 |  | 58,000,000 |  |  | 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 |  |  | 0 |  |
Macro Hedge Program [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 94,000,000 |  | 94,000,000 |  |  | 128,000,000 |  |
Macro Hedge Program [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 74,000,000 |  | 74,000,000 |  |  | 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 |  |  | 0 |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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ERROR in label resolution. | Level 1 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Equity Contract [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Equity Contract [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Equity Contract [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Equity Contract [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Equity Contract [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Equity Contract [Member] | Level 3 [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Foreign Exchange Contract [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Foreign Exchange Contract [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Foreign Exchange Contract [Member] | Level 1 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Interest Rate Contract [Member] | Level 2 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Interest Rate Contract [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (462,000,000) |  | (462,000,000) |  |  | (521,000,000) |  |
Interest Rate Contract [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Other Contract [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Other Contract [Member] | Level 1 [Member] | Other Investments [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 |  |  |  |  |  | 0 |  |
Other Contract [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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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 | 151,000,000 |  | 151,000,000 |  |  | (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 | 19,000,000 |  | 19,000,000 |  |  | (361,000,000) |  |
Derivative Financial Instruments, Assets [Member] | Level 3 [Member] | Other Investments [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] | Other liabilities [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | (653,000,000) |  | (653,000,000) |  |  | (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 | 44,000,000 |  | 44,000,000 |  |  | 47,000,000 |  |
Guaranteed Minimum Withdrawal Benefit [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Guaranteed Minimum Withdrawal Benefit [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Guaranteed Minimum Withdrawal Benefit [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Portion at Other than Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |  |  |  |  |
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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 | 43.00% |  | 43.00% |  |  | 39.00% |  |
Private Equity Funds [Member] | Separate Accounts [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
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