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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Actuarial changes, tax $ 25 $ 16 $ 33 $ 23
Prior service costs, tax $ 196   $ 197 $ 1