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Insurance Premiums and Service Revenue Earned (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Premiums Written and Earned [Abstract]      
Direct Premiums Written, Property and Casualty $ 332 $ 342 $ 330
Direct Premiums Earned, Property and Casualty 335 309 308
Assumed Premiums Written, Property and Casualty 44 38 210
Assumed Premiums Earned, Property and Casualty 49 76 281
Gross Insurance Premiums Written 376 380 540
Gross Insurance Premiums Earned 384 385 589
Ceded Premiums Written, Property and Casualty (141) (129) (229)
Ceded Premiums Earned, Property and Casualty (109) (126) (228)
Premiums Written, Net, Property and Casualty 235 251 311
Premiums Earned, Net, Property and Casualty 275 259 361
Insurance Commissions and Fees Written 826 788 718
Insurance Commissions and Fees 780 894 981
Insurance Services Revenue Written 1,061 1,039 1,029
Insurance premiums and service revenue earned $ 1,055 $ 1,153 $ 1,342