v2.4.0.6
Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
U.S. (Pension Benefits) [Member]
        
Components of Net Periodic Benefit Cost        
Service cost $ 33 $ 56 $ 133 $ 169
Interest cost 39 62 150 185
Expected return on plan assets (47) (70) (177) (210)
Amortization of prior service cost 1 2 5 7
Recognized net actuarial (gain) loss 41 42 145 124
Net periodic benefit cost 67 92 256 275
Int'l (Pension Benefits) [Member]
        
Components of Net Periodic Benefit Cost        
Service cost 20 25 70 74
Interest cost 35 45 116 133
Expected return on plan assets (37) (44) (120) (131)
Amortization of prior service cost (2) 0 (6) 0
Recognized net actuarial (gain) loss 13 11 46 34
Net periodic benefit cost 29 37 106 110
Other Benefits [Member]
        
Components of Net Periodic Benefit Cost        
Service cost 1 3 5 8
Interest cost 8 10 26 31
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (1) (1) (3) (5)
Recognized net actuarial (gain) loss 0 (1) (1) (4)
Net periodic benefit cost $ 8 $ 11 $ 27 $ 30