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Retirement Plans (Details 7) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net periodic benefit cost      
Net periodic pension benefit cost $ 347 $ 326 $ 282
Pension Plans, Defined Benefit [Member]
     
Net periodic benefit cost      
Service cost 19 22 19
Interest cost 115 126 126
Expected return on plan assets (139) (148) (145)
Amortization of prior service cost (1) 0 (1)
Recognized net actuarial loss 66 36 23
Settlements losses (14) (15) (18)
Net periodic pension benefit cost $ 74 $ 51 $ 40