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Pension and Postretirement Benefit Plans - Reconciliations of Changes in Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of fair value of plan assets [Roll Forward]:      
Fair value at beginning of period $ 1,666    
Fair value at end of period 1,533 $ 1,666  
United States Pension Plan of US Entity [Member]      
Reconciliation of benefit obligation [Roll Forward]:      
Obligation at beginning of period 1,823 1,805  
Interest cost $ 66 $ 80 $ 74
Service cost
Actuarial (gain) loss $ (70) $ 212  
Benefit payments $ (127) $ (124)  
New plans  
Settlements $ (133)  
Other $ (17)  
Translation adjustments  
Obligation at end of period $ 1,692 $ 1,823 $ 1,805
Reconciliation of fair value of plan assets [Roll Forward]:      
Fair value at beginning of period 1,622 1,649  
Actual return on plan assets $ (2) $ 230  
Employer contributions  
Benefit payments $ (127) $ (124)  
Settlements $ (133)  
Translation adjustments  
Fair value at end of period $ 1,493 $ 1,622 1,649
Funded status at end of period (199) (201)  
Foreign Pension Plan [Member]      
Reconciliation of benefit obligation [Roll Forward]:      
Obligation at beginning of period 325 313  
Interest cost 8 11 11
Service cost 5 6 6
Actuarial (gain) loss (5) 54  
Benefit payments (11) (16)  
New plans 4 16  
Settlements $ (2) (7)  
Other (11)  
Translation adjustments $ (36) (41)  
Obligation at end of period 288 325 313
Reconciliation of fair value of plan assets [Roll Forward]:      
Fair value at beginning of period 44 42  
Actual return on plan assets 3 2  
Employer contributions 12 16  
Benefit payments (11) (16)  
Settlements (2) (7)  
New plans $ 3 18  
Asset reversion (6)  
Translation adjustments $ (9) (5)  
Fair value at end of period 40 44 42
Funded status at end of period (248) (281)  
Foreign Postretirement Benefit Plan [Member]      
Reconciliation of benefit obligation [Roll Forward]:      
Obligation at beginning of period 110 112  
Interest cost 3 5 5
Service cost 1 1 1
Actuarial (gain) loss (6) 10  
Benefit payments $ (5) $ (6)  
New plans  
Settlements  
Other  
Translation adjustments $ (17) $ (12)  
Obligation at end of period 86 110 112
Reconciliation of fair value of plan assets [Roll Forward]:      
Fair value at beginning of period $ 0 $ 0  
Actual return on plan assets  
Employer contributions $ 5 $ 6  
Benefit payments $ (5) $ (6)  
Settlements  
Translation adjustments  
Fair value at end of period $ 0 $ 0 $ 0
Funded status at end of period $ (86) $ (110)