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Separate Accounts, Death Benefits and Other Insurance Benefit Features Level 4 (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2] | $ 18,970,000,000 |  | $ 18,970,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 3,380,000,000 |  | 3,380,000,000 |  |  |
Separate Accounts, Liability |  | 117,851,000,000 | [1] | 117,851,000,000 | [1] |  | $ 120,123,000,000
Net Amount at Risk by Product and Guarantee, Separate Account Value | [1] | 79,917,000,000 |  | 79,917,000,000 |  |  |
Separate Accounts by Major Category of Investment [Abstract] |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value |  | $ 37,934,000,000 |  | $ 37,934,000,000 |  |  | $ 40,423,000,000
Invested in Fixed Income Securities |  | 17.00% |  | 17.00% |  |  | 17.00%
Invested in Equity Securities |  | 83.00% |  | 83.00% |  |  | 83.00%
MAV Only [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2] | $ 13,801,000,000 |  | $ 13,801,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2] |  |  | 71 years |  |  |
With Five Percent Rollup [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2],[4] | 1,192,000,000 |  | $ 1,192,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2],[4] |  |  | 71 years |  |  |
With Earnings Protection Benefit Rider (EPB) [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2],[5] | 3,507,000,000 |  | $ 3,507,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2],[5] |  |  | 70 years |  |  |
With Five Percent Rollup and EPB [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2] | 470,000,000 |  | $ 470,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2] |  |  | 72 years |  |  |
Asset Protection Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2],[6] | 10,850,000,000 |  | $ 10,850,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2],[6] |  |  | 69 years |  |  |
Lifetime Income Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2],[7] | 483,000,000 |  | $ 483,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2],[7] |  |  | 69 years |  |  |
Reset [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2] | 2,453,000,000 |  | $ 2,453,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2] |  |  | 70 years |  |  |
Return of Net Deposit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2] | 8,982,000,000 |  | $ 8,982,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2] |  |  | 68 years |  |  |
Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 597,000,000 |  | $ 597,000,000 |  |  |
Guaranteed Minimum Death Benefit [Member] |  |  |  |  |  |  |
Movement in Changes in the gross U.S. GMDB, International GMDB/GMIB, and UL Secondary Guarantee Benefits [Roll Forward] |  |  |  |  |  |  |
Liability, balance as of January 1 | [8] |  |  | 863,000,000 |  | $ 812,000,000 |
Incurred | [8],[9],[10] |  |  | 41,000,000 |  | 20,000,000 |
Liabilities for Guarantees on Long-Duration Contracts, Benefits Paid | [8] |  |  | (66,000,000) |  | (56,000,000) |
Liability balance as of September 30 | [8] | 838,000,000 |  | 838,000,000 |  | 776,000,000 |
Reinsurance recoverable asset, as of January 1 | [8] |  |  | 523,000,000 |  | 481,000,000 |
Incurred | [8] | 32,000,000 |  | 32,000,000 |  | 51,000,000 |
Paid | [8] | (51,000,000) |  | (51,000,000) |  | (45,000,000) |
Reinsurance recoverable asset, as of September 30 | [8] | 504,000,000 |  | 504,000,000 |  | 487,000,000 |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1] | 3,804,000,000 |  | $ 3,804,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | [2],[11] |  |  | 70 years |  |  |
Separate Accounts, Liability | [1] | 37,934,000,000 |  | $ 37,934,000,000 |  |  |
Guaranteed Minimum Withdrawal Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value |  | 6,600,000,000 |  | 6,600,000,000 |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk |  | $ 0 |  | 0 |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age |  | 72 years |  |  |  |  |
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, General Account Value | [1],[2],[11] | $ 41,738,000,000 |  | 41,738,000,000 |  |  |
Universal Life [Member] | Secondary Guarantees [Member] |  |  |  |  |  |  |
Movement in Changes in the gross U.S. GMDB, International GMDB/GMIB, and UL Secondary Guarantee Benefits [Roll Forward] |  |  |  |  |  |  |
Liability, balance as of January 1 | [8] |  |  | 2,313,000,000 |  | 2,041,000,000 |
Incurred | [8],[9],[10] |  |  | 158,000,000 |  | 135,000,000 |
Liability balance as of September 30 | [8] | 2,471,000,000 |  | 2,471,000,000 |  | 2,176,000,000 |
Reinsurance recoverable asset, as of January 1 | [8] |  |  | 2,313,000,000 |  | 2,041,000,000 |
Incurred | [8] | 158,000,000 |  | 158,000,000 |  | 135,000,000 |
Reinsurance recoverable asset, as of September 30 | [8] | 2,471,000,000 |  | 2,471,000,000 |  | $ 2,176,000,000 |
MAV Only [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 2,599,000,000 |  | 2,599,000,000 |  |  |
MAV Only [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 429,000,000 |  | 429,000,000 |  |  |
With Five Percent Rollup [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[4] | 215,000,000 |  | 215,000,000 |  |  |
With Five Percent Rollup [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[4] | 71,000,000 |  | 71,000,000 |  |  |
With Earnings Protection Benefit Rider (EPB) [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[5] | 463,000,000 |  | 463,000,000 |  |  |
With Earnings Protection Benefit Rider (EPB) [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[5] | 74,000,000 |  | 74,000,000 |  |  |
With Five Percent Rollup and EPB [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 103,000,000 |  | 103,000,000 |  |  |
With Five Percent Rollup and EPB [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 23,000,000 |  | 23,000,000 |  |  |
Asset Protection Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[6] | 392,000,000 |  | 392,000,000 |  |  |
Asset Protection Benefit [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[6] | 261,000,000 |  | 261,000,000 |  |  |
Lifetime Income Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[7] | 8,000,000 |  | 8,000,000 |  |  |
Lifetime Income Benefit [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[7] | 8,000,000 |  | 8,000,000 |  |  |
Reset [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 31,000,000 |  | 31,000,000 |  |  |
Reset [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 30,000,000 |  | 30,000,000 |  |  |
Return of Net Deposit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 74,000,000 |  | 74,000,000 |  |  |
Return of Net Deposit [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3] | 69,000,000 |  | 69,000,000 |  |  |
Guaranteed Minimum Death Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[11] | 3,885,000,000 |  | 3,885,000,000 |  |  |
Guaranteed Minimum Death Benefit [Member] | Annuitization Benefit [Member] |  |  |  |  |  |  |
Minimum Guarantees, Net Amount at Risk [Abstract] |  |  |  |  |  |  |
Net Amount at Risk by Product and Guarantee, Net Amount at Risk | [2],[3],[11] | 965,000,000 |  | 965,000,000 |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
Separate Accounts by Major Category of Investment [Abstract] |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value |  | 34,783,000,000 |  | 34,783,000,000 |  |  | $ 36,970,000,000
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |
Separate Accounts by Major Category of Investment [Abstract] |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment, Fair Value |  | $ 3,151,000,000 |  | $ 3,151,000,000 |  |  | $ 3,453,000,000
[1] | AV includes the contract holder’s investment in the separate account and the general account.
[2] | MAV GMDB is the greatest of current AV, net premiums paid and the highest AV on any anniversary before age 80 years (adjusted for withdrawals).
[3] | NAR is defined as the guaranteed benefit in excess of the current AV. RNAR represents NAR reduced for reinsurance. NAR and RNAR are highly sensitive to equity markets movements and increase when equity markets decline.
[4] | Rollup GMDB is the greatest of the MAV, current AV, net premium paid and premiums (adjusted for withdrawals) accumulated at generally 5% simple interest up to the earlier of age 80 years or 100% of adjusted premiums.
[5] | EPB GMDB is the greatest of the MAV, current AV, or contract value plus a percentage of the contract’s growth. The contract’s growth is AV less premiums net of withdrawals, subject to a cap of 200% of premiums net of withdrawals.
[6] | APB GMDB is the greater of current AV or MAV, not to exceed current AV plus 25% times the greater of net premiums and MAV (each adjusted for premiums in the past 12 months).
[7] | LIB GMDB is the greatest of current AV; net premiums paid; or, for certain contracts, a benefit amount generally based on market performance that ratchets over time.
[8] | [1] Included in Reserve for future policy benefits and unpaid losses and loss adjustment expenses on the Condensed Consolidated Balance Sheets
[9] | [2]These liability balances include all GMDB benefits, plus the life-contingent portion of GMWB benefits in excess of the return of the GRB. GMWB benefits up to the return of the GRB are embedded derivatives held at fair value and are excluded from these balances.
[10] | [3]Includes the portion of assessments established as additions to reserves as well as changes in estimates affecting the reserves.
[11] | Some variable annuity contracts with GMDB also have a life-contingent GMWB that may provide for benefits in excess of the return of the GRB. Such contracts included in this amount have $6.6 billion of total account value and weighted average attained age of 72 years. There is no NAR or retained NAR related to these contracts.

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- Definition Amount of guaranteed minimum benefit payments to policyholders and contract holders, during the period presented, resulting in a decrease to the liability for expected guaranteed minimum benefits in excess of projected account values. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Amount of guaranteed minimum benefit expense incurred for expected guaranteed minimum benefits in excess of projected account values. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Value of the general accounts corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Net amount at risk, representing the guaranteed benefit in excess of the current account balance corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(3),(5) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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- Definition Value of the separate accounts corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(1)) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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- Definition Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(5)) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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- Definition Sum of the amount of guaranteed minimum benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables on paid losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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