v2.4.0.8
Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
U.S. (Pension Benefits) [Member]
        
Components of Net Periodic Benefit Cost        
Service cost $ 34 $ 42 $ 69 $ 100
Interest cost 36 48 72 111
Expected return on plan assets (46) (56) (93) (130)
Amortization of prior service cost 1 2 3 4
Recognized net actuarial (gain) loss 38 45 75 104
Net periodic benefit cost 63 81 126 189
Int'l (Pension Benefits) [Member]
        
Components of Net Periodic Benefit Cost        
Service cost 25 22 51 50
Interest cost 36 38 73 81
Expected return on plan assets (39) (40) (80) (83)
Amortization of prior service cost (2) (2) (4) (4)
Recognized net actuarial (gain) loss 18 15 37 33
Net periodic benefit cost 38 33 77 77
Other Benefits [Member]
        
Components of Net Periodic Benefit Cost        
Service cost 1 2 2 4
Interest cost 6 8 12 18
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (1) (1) (2) (2)
Recognized net actuarial (gain) loss 1 0 2 (1)
Net periodic benefit cost $ 7 $ 9 $ 14 $ 19