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Consolidated Statement of Comprehensive Income (Alternative) (Unaudited) (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 Income and Comprehensive Income [Abstract]        
Total comprehensive income $ 2,257 $ 5,134 $ 6,975 $ 10,467