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Shareholders' Equity (Schedule of changes in AOCI by component) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Accumulated Translation Adjustment [Member]
Mar. 31, 2013
Unrealized Gains and Losses on Certain Investments
Dec. 31, 2012
Unrealized Gains and Losses on Certain Investments
Mar. 31, 2013
Unrealized Gains and Losses on Derivative Instruments
Mar. 31, 2013
Defined Benefit Pension Plans and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balance January 1, 2013 $ (17,416) $ 214 $ (8) $ (8) $ 86 $ (17,708)
OCI before reclassifications (17) (23)     (26) 32
Amounts reclassified from AOCI 392       2 390
Net current period OCI 375 (23)     (24) 422
Balance March 31, 2013 $ (17,041) $ 191 $ (8) $ (8) $ 62 $ (17,286)