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Schedule of accumulated other comprehensive income (loss) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Tax on cumulative foreign currency translation adjustment      
Cumulative foreign currency translation adjustment 161 121
Tax on pension and postretirement benefits 387 326
Pension and postretirement benefits (721) (609)
Tax on net unrealized gains (losses) on investments with OTTI losses (11) 33
Net unrealized gains (losses) on investments with OTTI losses 20 (64)
Tax on net unrealized gains (losses) on other investments (721) (538)
Net unrealized gains (losses) on other investments 1,371 1,032
Tax on accumulated other comprehensive income (loss) (345) (179)
Accumulated other comprehensive income (loss) $ 831 $ 480