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Operations and summary of significant accounting policies (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operations and summary of significant accounting policies      
Restricted assets of consolidated QSPE     $ 324
Restricted liability of consolidated QSPE     327
Accumulated Other Comprehensive Income (Loss)      
Foreign currency translation 206 551 603
Pension and other postretirement benefits (6,568) (4,695) (4,439)
Derivative financial instruments (10) 45 60
Retained interests     (3)
Available-for-sale securities 44 48 15
Total accumulated other comprehensive income (loss) $ (6,328) $ (4,051) $ (3,764)