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Variable Annuity Reinsurance (Details)
 3 Months Ended 3 Months Ended
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Mar. 31, 2012
JPY (¥)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
JPY (¥)
Mar. 31, 2012
Fixed income/Interest rate
USD ($)
Mar. 31, 2011
Fixed income/Interest rate
USD ($)
Mar. 31, 2012
Foreign exchange
USD ($)
Mar. 31, 2011
Foreign exchange
USD ($)
Mar. 31, 2012
Equity
USD ($)
Mar. 31, 2011
Equity
USD ($)
Mar. 31, 2012
Level 1 Inputs
USD ($)
Mar. 31, 2011
Level 1 Inputs
USD ($)
Mar. 31, 2012
Level 2 Inputs
USD ($)
Mar. 31, 2011
Level 2 Inputs
USD ($)
Mar. 31, 2012
Level 3 Inputs
USD ($)
Mar. 31, 2011
Level 3 Inputs
USD ($)
Mar. 31, 2012
Fair Value
USD ($)
Mar. 31, 2011
Fair Value
USD ($)
Mar. 31, 2012
WM Life Re
USD ($)
rating
Mar. 31, 2011
WM Life Re
USD ($)
Dec. 31, 2011
WM Life Re
USD ($)
Mar. 31, 2012
WM Life Re
Citigroup
USD ($)
Mar. 31, 2012
WM Life Re
Royal Bank of Scotland
USD ($)
Mar. 31, 2012
WM Life Re
Bank of America
USD ($)
Mar. 31, 2012
WM Life Re
JP Morgan
USD ($)
Mar. 31, 2012
WM Life Re
Nomura
USD ($)
Mar. 31, 2012
WM Life Re
Barclays
USD ($)
Mar. 31, 2012
WM Life Re
Goldman Sachs
USD ($)
Mar. 31, 2012
WM Life Re
Cash
USD ($)
Dec. 31, 2011
WM Life Re
Cash
USD ($)
Mar. 31, 2012
WM Life Re
Fixed maturity investments.
USD ($)
Dec. 31, 2011
WM Life Re
Fixed maturity investments.
USD ($)
Mar. 31, 2012
WM Life Re
Short-term investments
USD ($)
Dec. 31, 2011
WM Life Re
Short-term investments
USD ($)
Variable annuity reinsurance                                                                      
Total guarantee value $ 2,800,000,000   ¥ 232,700,000,000 $ 3,000,000,000 ¥ 233,700,000,000                                                            
Collective account values of underlying variable annuities as a percentage of the guarantee value 84.00%     78.00% 78.00%                                                            
Pre-tax operating results of WM Life Re                                                                      
Fees, included in other revenues                                       8,000,000 7,900,000                            
Change in fair value of variable annuity liability, included in other revenues                                       211,200,000 52,300,000                            
Change in fair value of derivatives, included in other revenues (206,500,000) (65,500,000)       (79,000,000) (6,200,000) (55,000,000) (47,400,000) (72,500,000) (11,900,000) (48,000,000) (19,600,000) (98,200,000) (20,700,000) (60,300,000) (25,200,000) (206,500,000) (65,500,000) (206,500,000) (65,500,000)                            
Foreign exchange, included in other revenues                                       (23,000,000) (4,600,000)                            
Other investment income and gain (loss)                                       (2,100,000) (400,000)                            
Total revenues 630,600,000 529,600,000                                   (12,400,000) (10,300,000)                            
Change in fair value of variable annuity death benefit liabilities, included in other expenses                                       8,800,000 3,000,000                            
Death benefit claims paid, included in other expenses                                       (1,800,000) (1,000,000)                            
General and administrative expenses (45,500,000) (28,000,000)                                   (1,300,000) (700,000)                            
Pre-tax loss 128,300,000 (33,700,000)                                   (6,700,000) (9,000,000)                            
Changes in variable annuity liabilities                                                                      
Balance of liabilities at the beginning of the period                               (768,500,000) (610,200,000)                                    
Realized and unrealized gains (losses)                               220,000,000 55,300,000                                    
Balance of liabilities at the end of the period                               (548,500,000) (554,900,000)                                    
Changes in derivative instruments                                                                      
Balance of assets at the beginning of the period 290,400,000         31,100,000   161,300,000   98,000,000   4,100,000   39,200,000 72,200,000 247,100,000 275,300,000 290,400,000 347,500,000                                
Purchases                               6,100,000 5,000,000 6,100,000 5,000,000                                
Realized and unrealized gains (losses) (206,500,000) (65,500,000)       (79,000,000) (6,200,000) (55,000,000) (47,400,000) (72,500,000) (11,900,000) (48,000,000) (19,600,000) (98,200,000) (20,700,000) (60,300,000) (25,200,000) (206,500,000) (65,500,000) (206,500,000) (65,500,000)                            
Sales/settlements                       34,500,000 26,900,000 58,900,000 3,300,000 (9,100,000) (29,100,000) 84,300,000 1,100,000                                
Balance of assets at the end of the period 174,300,000         4,000,000   109,500,000   60,800,000   (9,400,000) 7,300,000 (100,000) 54,800,000 183,800,000 226,000,000 174,300,000 288,100,000                                
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 (206,500,000) (65,500,000)       (79,000,000) (6,200,000) (55,000,000) (47,400,000) (72,500,000) (11,900,000) (48,000,000) (19,600,000) (98,200,000) (20,700,000) (60,300,000) (25,200,000) (206,500,000) (65,500,000) (206,500,000) (65,500,000)                            
Carrying value 174,300,000         4,000,000   109,500,000   60,800,000   (9,400,000) 7,300,000 (100,000) 54,800,000 183,800,000 226,000,000 174,300,000 288,100,000                                
Credit risk on derivative instruments                                                                      
OTC derivative instruments                                       190,700,000   295,400,000                          
Collateral held                                       (43,900,000)   (73,200,000)               360,100,000 453,500,000 29,300,000 31,200,000 1,500,000 600,000
Collateral provided                                       115,400,000   83,000,000                       43,900,000 73,200,000
Cash and short-term investments held and posted as collateral to its reinsurance counterparties                                       390,900,000 301,300,000 485,300,000                          
Net exposure to credit losses on fair value of OTC instruments                                       262,200,000   305,200,000 63,400,000 59,800,000 52,800,000 35,800,000 28,500,000 17,900,000 4,000,000            
Number of creditworthiness ratings                                       21                              
Adjustments for counterparty credit risk                                       $ (7,000,000)   $ (9,100,000)