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Shareholders' Equity (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Components of accumulated other comprehensive income        
Accumulated other comprehensive income, net unrealized gains on securities, beginning balance $ 771 [1] $ 605 $ 578 [1] $ 491
Other comprehensive income, net unrealized gains on securities, pretax 238 (24) 539 155
Other comprehensive income, net unrealized gains on securities, tax (84) 9 (189) (54)
Other comprehensive income, net unrealized gains on securities, noncontrolling interests (4) (2) (7) (4)
Other comprehensive income, net unrealized gains on securities, net of tax, attributable to parent 150 (17) 343 97
Accumulated other comprehensive income, net unrealized gains on securities, ending balance 921 [1] 588 921 [1] 588
Accumulated other comprehensive income, foreign currency translation adjustments, beginning balance 9 17 10 12
Other comprehensive income, foreign currency translation adjustments, pretax 10 (14) 9 (9)
Other comprehensive income, foreign currency translation adjustments, noncontrolling interests (1) 1 (1) 1
Other comprehensive income, foreign currency translation adjustments, net of tax, attributable to parent 9 (13) 8 (8)
Other change in accumulated other comprehensive income, foreign currency translation adjustments (1) [2]   (1) [2]  
Accumulated other comprehensive income, foreign currency translation adjustments, ending balance 17 4 17 4
Accumulated other comprehensive income, pension and other postretirement plans adjustments, beginning balance (7) (7) (8) (8)
Other comprehensive income, pension and other postretirement plans adjustments, pretax       1 1
Other comprehensive income, pension and other postretirement plans adjustments, net of tax, attributable to parent       1 1
Accumulated other comprehensive income, pension and other postretirement plans adjustments, ending balance (7) (7) (7) (7)
Accumulated other comprehensive income, total, beginning balance 773 615 580 495
Other comprehensive income, total, pretax 248 (38) 549 147
Other comprehensive income, total, tax (84) 9 (189) (54)
Other comprehensive income, total, noncontrolling interests (5) (1) (8) (3)
Other comprehensive income, total, net of tax, attributable to parent 159 (30) 352 90
Other change in accumulated other comprehensive, total (1) [2]   (1) [2]  
Accumulated other comprehensive income, total, ending balance $ 931 $ 585 $ 931 $ 585
[1] Includes net unrealized gains of $23 million at September 30, 2012 compared to net unrealized losses of $1 million at June 30, 2012 and $16 million at December 31, 2011 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.
[2] Other relates to the third quarter of 2012 acquisition of noncontrolling interest in a subsidiary.