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Variable Annuity Reinsurance (Details) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2011 USD ($) | Jun. 30, 2010 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2010 USD ($) | Jun. 30, 2011 WM Life Re USD ($) | Jun. 30, 2010 WM Life Re USD ($) | Jun. 30, 2011 WM Life Re USD ($) | Jun. 30, 2010 WM Life Re USD ($) | Dec. 31, 2010 WM Life Re USD ($) | Jun. 30, 2011 WM Life Re Variable annuity reinsurance. USD ($) | Jun. 30, 2010 WM Life Re Variable annuity reinsurance. USD ($) | Jun. 30, 2011 WM Life Re Variable annuity reinsurance. USD ($) | Jun. 30, 2010 WM Life Re Variable annuity reinsurance. USD ($) | Jun. 30, 2011 WM Life Re Cash. USD ($) | Dec. 31, 2010 WM Life Re Cash. USD ($) | Jun. 30, 2011 WM Life Re Fixed maturity investments USD ($) | Dec. 31, 2010 WM Life Re Fixed maturity investments USD ($) | Jun. 30, 2011 WM Life Re Short-term investments USD ($) | Dec. 31, 2010 WM Life Re Short-term investments USD ($) | Jun. 30, 2011 WM Life Re Citigroup USD ($) | Jun. 30, 2011 WM Life Re Royal Bank of Scotland USD ($) | Jun. 30, 2011 WM Life Re Bank of America USD ($) | Jun. 30, 2011 WM Life Re Barclays USD ($) | Jun. 30, 2011 WM Life Re Goldman Sachs USD ($) | Jun. 30, 2011 WM Life Re Other. USD ($) | Jun. 30, 2011 Level 3 Inputs Variable annuity reinsurance. USD ($) | Jun. 30, 2011 Level 3 Inputs Variable annuity reinsurance. USD ($) | Jun. 30, 2011 Variable annuity reinsurance. USD ($) | Jun. 30, 2011 Variable annuity reinsurance. JPY (¥) | Dec. 31, 2010 Variable annuity reinsurance. USD ($) | Dec. 31, 2010 Variable annuity reinsurance. JPY (¥) | Jun. 30, 2011 Level 1 Inputs USD ($) | Jun. 30, 2011 Level 1 Inputs USD ($) | Jun. 30, 2011 Level 2 Inputs USD ($) | Jun. 30, 2011 Level 2 Inputs USD ($) | Jun. 30, 2011 Level 3 Inputs USD ($) | Jun. 30, 2011 Level 3 Inputs USD ($) | Jun. 30, 2011 Fair Value USD ($) | Jun. 30, 2011 Fair Value USD ($) | Jun. 30, 2011 Fixed income/Interest rate USD ($) | Jun. 30, 2010 Fixed income/Interest rate USD ($) | Jun. 30, 2011 Fixed income/Interest rate USD ($) | Jun. 30, 2010 Fixed income/Interest rate USD ($) | Jun. 30, 2011 Foreign exchange USD ($) | Jun. 30, 2010 Foreign exchange USD ($) | Jun. 30, 2011 Foreign exchange USD ($) | Jun. 30, 2010 Foreign exchange USD ($) | Jun. 30, 2011 Equity USD ($) | Jun. 30, 2010 Equity USD ($) | Jun. 30, 2011 Equity USD ($) | Jun. 30, 2010 Equity USD ($) | Jun. 30, 2011 Other.
Variable annuity reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total guarantee value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000,000 | ¥ 235,300,000,000 | $ 2,900,000,000 | ¥ 237,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collective account values of underlying variable annuities as a percentage of the guarantee value (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 83.00% | 83.00% | 82.00% | 82.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax operating results of WM Life Re |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees, included in other revenues |  |  |  |  | 8,000,000 | 7,200,000 | 15,900,000 | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of variable annuity liability, included in other revenues |  |  |  |  |  |  |  |  |  | (35,900,000) | (186,200,000) | 16,400,000 | (151,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of derivatives, included in other revenues | 22,000,000 | 172,800,000 | (43,500,000) | 130,500,000 | 22,000,000 | 172,800,000 | (43,500,000) | 130,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | (16,800,000) | 12,500,000 | (8,200,000) | 6,700,000 | (18,500,000) | 22,000,000 | (43,500,000) | (6,300,000) | 19,200,000 | (12,500,000) | 23,400,000 | 17,100,000 | 74,500,000 | (30,200,000) | 68,500,000 | 11,200,000 | 79,100,000 | (800,000) | 38,600,000 |
Foreign exchange, included in other revenues |  |  |  |  | 6,900,000 | 7,700,000 | 2,300,000 | 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investment income and gains (losses) |  |  |  |  | (200,000) | (200,000) | (600,000) | (500,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 571,100,000 | 689,600,000 | 1,119,100,000 | 1,503,300,000 | 800,000 | 1,300,000 | (9,500,000) | (1,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of variable annuity death benefit liabilities, included in other expenses |  |  |  |  |  |  |  |  |  | (500,000) | (8,100,000) | (2,500,000) | (6,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Death benefit claims paid, included in other expenses |  |  |  |  | (700,000) | (400,000) | (1,700,000) | (800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | (56,200,000) | (52,300,000) | (84,200,000) | (87,400,000) | (1,400,000) | (1,400,000) | (2,100,000) | (3,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations | 34,400,000 | 4,000,000 | (200,000) | (20,200,000) | (1,800,000) | (8,600,000) | (10,800,000) | (11,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in variable annuity liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of liabilities, at the beginning of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (554,900,000) | (610,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,400,000) | 18,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of liabilities, at the end of the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (591,300,000) | (591,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of assets, at the beginning of the period |  |  | 347,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 |  | 54,800,000 | 72,200,000 | 226,000,000 | 275,300,000 | 288,100,000 | 347,500,000 |  |  | 43,900,000 |  |  |  | 225,300,000 |  |  |  | 78,300,000 |  |
Purchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized gains (losses) | 22,000,000 | 172,800,000 | (43,500,000) | 130,500,000 | 22,000,000 | 172,800,000 | (43,500,000) | 130,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | (16,800,000) | 12,500,000 | (8,200,000) | 6,700,000 | (18,500,000) | 22,000,000 | (43,500,000) | (6,300,000) | 19,200,000 | (12,500,000) | 23,400,000 | 17,100,000 | 74,500,000 | (30,200,000) | 68,500,000 | 11,200,000 | 79,100,000 | (800,000) | 38,600,000 |
Sales/settlements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,000,000) | 4,900,000 | (19,100,000) | (15,800,000) |  | (29,100,000) | (41,100,000) | (40,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of assets, at the end of the period | 269,000,000 |  | 269,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 591,300,000 | 591,300,000 |  |  |  |  | (11,900,000) | (11,900,000) | 48,200,000 | 48,200,000 | 232,700,000 | 232,700,000 | 269,000,000 | 269,000,000 | 48,800,000 |  | 48,800,000 |  | 161,200,000 |  | 161,200,000 |  | 59,000,000 |  | 59,000,000 |  |
Realized and unrealized derivative gains (losses) recognized in other revenues and carrying values of instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized derivative gains (losses) recognized in other revenues | 22,000,000 | 172,800,000 | (43,500,000) | 130,500,000 | 22,000,000 | 172,800,000 | (43,500,000) | 130,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | (16,800,000) | 12,500,000 | (8,200,000) | 6,700,000 | (18,500,000) | 22,000,000 | (43,500,000) | (6,300,000) | 19,200,000 | (12,500,000) | 23,400,000 | 17,100,000 | 74,500,000 | (30,200,000) | 68,500,000 | 11,200,000 | 79,100,000 | (800,000) | 38,600,000 |
Carrying Value | 269,000,000 |  | 269,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 591,300,000 | 591,300,000 |  |  |  |  | (11,900,000) | (11,900,000) | 48,200,000 | 48,200,000 | 232,700,000 | 232,700,000 | 269,000,000 | 269,000,000 | 48,800,000 |  | 48,800,000 |  | 161,200,000 |  | 161,200,000 |  | 59,000,000 |  | 59,000,000 |  |
Credit risk on derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OTC derivative instruments |  |  |  |  | 284,200,000 |  | 284,200,000 |  | 351,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral held |  |  |  |  | (52,600,000) |  | (52,600,000) |  | (101,000,000) |  |  |  |  |  |  | (1,000,000) | (48,600,000) | (51,600,000) | (52,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral provided |  |  |  |  | 35,400,000 |  | 35,400,000 |  | 25,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net exposure to credit losses on fair value of OTC instruments |  |  |  |  | 267,000,000 |  | 267,000,000 |  | 275,800,000 |  |  |  |  |  |  |  |  |  |  | 73,500,000 | 73,400,000 | 50,100,000 | 25,900,000 | 9,800,000 | 34,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of creditworthiness ratings | 21 |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the uncollateralized amount due under WM Life Re's derivative contracts for AA creditworthiness rating (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.00%
Percentage of the uncollateralized amount due under WM Life Re's derivative contracts for A+ creditworthiness rating (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.00%
Percentage of the uncollateralized amount due under WM Life Re's derivative contracts for BBB+ creditworthiness rating (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56.00%
Additional collateral |  |  |  |  | 370,500,000 |  | 370,500,000 |  | 326,000,000 |  |  |  |  | 345,900,000 | 291,100,000 | 11,400,000 | 3,300,000 | 13,200,000 | 31,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments for counterparty credit risk |  |  |  |  | $ (3,300,000) |  | $ (3,300,000) |  | $ (4,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Monetary decrease in the future benefit reserve resulting from amounts paid to policy and contract holders during the period for policy benefit claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-LHI -Chapter 9 -Paragraph 2, 27 -IssueDate 2006-05-01 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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