Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income Tax (Benefit) Expense (Details)

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Income Taxes - Components of Income Tax (Benefit) Expense (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current income tax expense (benefit)                      
U.S. federal                 $ (110) $ (5,875) $ (778)
U.S. state                 137 (161) 34
U.S. state                 210 11 255
Total current expense (benefit)                 237 (6,025) (489)
Deferred income tax (benefit) expense                      
U.S. federal                 (2,743) 2,199 (566)
U.S. state                 (723) (288) 472
Non-U.S.                 681 1,170 731
Total deferred (benefit) expense                 (2,785) 3,081 637
Income tax (benefit) expense (1,813) 246 (770) (211) (1,606) (537) (1,020) 219 (2,548) (2,944) 148
Tax effect on accumulated other comprehensive loss                 238 178 322
Tax effect on common stock and additional paid in capital from employee stock purchase plan activity                 $ 232 $ 43 $ 37