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Retirement Plans (Details 12) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Net Periodic Benefit Cost that are not yet recognized    
Tax impact $ 233 $ 233
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 488 481
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Net Periodic Benefit Cost that are not yet recognized    
Net actuarial loss 32 35
Total, pretax effect 32 35
Tax impact (12) (13)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax $ 20 $ 22