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Consolidated Statements of Comprehensive Income (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Comprehensive Income [Abstract]        
Shareholders' Net Income $ 505 $ 380 $ 562 $ 751
Net unrealized appreciation (deprecation) on securities:        
Net unrealized appreciation (depreciation), fixed maturities (269) 63 (341) 86
Net unrealized appreciation (depreciation), equity securities 0 1 2 2
Net unrealized appreciation (depreciation) on securities (269) 64 (339) 88
Net unrealized appreciation (depreciation), derivatives 6 5 9 0
Net translation of foreign currencies (16) (43) (74) (8)
Postretirement benefits liability adjustment 21 25 61 36
Shareholders' other comprehensive income (loss) (258) 51 (343) 116
Shareholders' comprehensive income (loss) 247 431 219 867
Comprehensive income (loss) attributable to noncontrolling interest:        
Net income (loss) attributable to redeemable noncontrolling interest 1 0 3 0
Other comprehensive income (loss) attributable to redeemable noncontrolling interest (6) 0 (9) 0
Total comprehensive income (loss) $ 242 $ 431 $ 213 $ 867