v2.4.0.6
Employee Benefit Plans - Net Periodic Benefit Cost Related to Continuing and Discontinued Operations of All Defined Benefit Plans (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
U.S. (Pension Benefits) [Member]
      
Components of Net Periodic Benefit Cost      
Service cost $ 225 $ 229 $ 194
Interest cost 247 260 277
Expected return on plan assets (280) (224) (184)
Amortization of prior service cost (credit) 9 10 11
Recognized net actuarial loss (gain) 165 167 186
Net periodic benefit cost 366 442 484
Int'l (Pension Benefits) [Member]
      
Components of Net Periodic Benefit Cost      
Service cost 98 90 79
Interest cost 178 169 144
Expected return on plan assets (175) (147) (125)
Amortization of prior service cost (credit)   2 1
Recognized net actuarial loss (gain) 46 55 35
Net periodic benefit cost 147 169 134
Other Benefits [Member]
      
Components of Net Periodic Benefit Cost      
Service cost 10 11 9
Interest cost 42 46 47
Amortization of prior service cost (credit) (7) 3 9
Recognized net actuarial loss (gain) (5) (7) (15)
Net periodic benefit cost $ 40 $ 53 $ 50