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Pension and Other Benefit Plans - Changes in Accumulated Postretirement Benefit Obligation, Plan Assets and Funded Status (Detail) (Postretirement medical plan, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Postretirement medical plan
   
Change in Projected Benefit Obligations    
Projected benefit obligation at beginning of year $ 1,410 $ 1,188
Service cost 48 29
Interest cost 56 58
Contributions by plan participants 6 6
Actuarial (gains) losses (232) 171
Benefits paid (41) (42)
Projected benefit obligation at end of year 1,247 1,410
Change in Plan Assets    
Plan assets at fair value at beginning of year 576 443
Company contributions 83 106
Contributions by plan participants 6 6
Benefits paid (41) (42)
Actual return on plan assets 107 63
Plan assets at fair value at end of year 731 576
(Unfunded Liability) / Asset (516) (834)
Amounts Recognized in Accumulated Other Comprehensive Loss    
Actuarial (gains) losses 87 411
Prior service cost (12) (16)
Total amount recognized in accumulated other comprehensive income $ 75 $ 395