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Retirement Plans (Details 7) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net periodic benefit cost      
Net periodic pension benefit cost $ 326 $ 282 $ 168
Defined benefit pension plan cost [Member]
      
Net periodic benefit cost      
Service cost 22 19 14
Interest cost 126 126 127
Expected return on plan assets (148) (145) (146)
Amortization of prior service cost 0 (1) 0
Recognized net actuarial loss 36 23 10
Settlements losses 15 18 19
Curtailment losses 0 0 (3)
Net periodic pension benefit cost $ 51 $ 40 $ 21