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Employee Benefit Plans - Combined Data for Domestic and Foreign Defined Benefit Pension and Post Retirement Healthcare Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Domestic pension benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 4.35% 4.48%  
Change in benefit obligation      
Benefit obligation at beginning of period $ (4,177) $ (4,460)  
Service cost 0 (30) $ (58)
Interest cost (182) (170) (180)
Employee contributions 0 0  
Amendments 0 0  
Actuarial gain (loss) (106) 178  
Divestitures 0 0  
Curtailments 0 94  
Special termination benefits 0 0  
Benefits paid 191 211  
Benefit obligation at end of period (4,274) (4,177) (4,460)
Change in fair value of plan assets      
Fair value at beginning of period 4,689 4,942  
Actual return on plan assets 387 (61)  
Employer contributions 21 19  
Employee contributions 0 0  
Acquisitions (divestitures) 0 0  
Benefit payments (191) (211)  
Fair value at end of period 4,906 4,689 4,942
Funded status at end of period 632 512  
Amounts recognized in accumulated other comprehensive (income) loss consist of:      
Net loss (gain) 1,656 1,678  
Prior service cost (credit) 0 0  
Total (before tax effects) $ 1,656 $ 1,678  
Foreign pension benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 2.53% 3.45%  
Rate of compensation increase 3.60% 3.51%  
Change in benefit obligation      
Benefit obligation at beginning of period $ (1,147) $ (1,177)  
Service cost (29) (32) (33)
Interest cost (36) (38) (43)
Employee contributions (1) (1)  
Amendments 0 0  
Actuarial gain (loss) (221) (1)  
Divestitures 0 12  
Curtailments 0 0  
Special termination benefits 0 0  
Benefits paid 23 17  
Foreign exchange adjustment 163 73  
Benefit obligation at end of period (1,248) (1,147) (1,177)
Change in fair value of plan assets      
Fair value at beginning of period 1,014 997  
Actual return on plan assets 162 40  
Employer contributions 87 51  
Employee contributions 1 1  
Acquisitions (divestitures) 0 1  
Benefit payments (23) (17)  
Foreign exchange adjustment (151) (59)  
Fair value at end of period 1,090 1,014 997
Funded status at end of period (158) (133)  
Amounts recognized in accumulated other comprehensive (income) loss consist of:      
Net loss (gain) 461 368  
Prior service cost (credit) 0 1  
Total (before tax effects) $ 461 $ 369  
Domestic Healthcare Benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 4.35% 4.48%  
Rate of compensation increase 3.00% 3.00%  
Change in benefit obligation      
Benefit obligation at beginning of period $ (184) $ (210)  
Service cost (1) (1)  
Interest cost (8) (8)  
Employee contributions 0 0  
Amendments 0 0  
Actuarial gain (loss) 9 17  
Divestitures 0 0  
Curtailments 0 0  
Special termination benefits 0 0  
Benefits paid 15 18  
Benefit obligation at end of period (169) (184) (210)
Change in fair value of plan assets      
Fair value at beginning of period 92 93  
Actual return on plan assets 5 (1)  
Employer contributions 15 18  
Employee contributions 0 0  
Acquisitions (divestitures) 0 0  
Benefit payments (15) (18)  
Fair value at end of period 97 92 93
Funded status at end of period (72) (92)  
Amounts recognized in accumulated other comprehensive (income) loss consist of:      
Net loss (gain) 96 111  
Prior service cost (credit) (59) (69)  
Total (before tax effects) $ 37 $ 42  
Foreign Healthcare Benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 2.60% 3.60%  
Change in benefit obligation      
Benefit obligation at beginning of period $ (4) $ (8)  
Service cost 0 0 0
Interest cost 0 0 0
Employee contributions 0 0  
Amendments 0 0  
Actuarial gain (loss) 1 1  
Divestitures 0 2  
Curtailments 0 0  
Special termination benefits 0 0  
Benefits paid 0 0  
Foreign exchange adjustment 1 1  
Benefit obligation at end of period (2) (4) (8)
Change in fair value of plan assets      
Fair value at beginning of period 0 0  
Actual return on plan assets 0 0  
Employer contributions 0 0  
Employee contributions 0 0  
Acquisitions (divestitures) 0 0  
Benefit payments 0 0  
Fair value at end of period 0 0 $ 0
Funded status at end of period (2) (4)  
Amounts recognized in accumulated other comprehensive (income) loss consist of:      
Net loss (gain) (2) (1)  
Prior service cost (credit) 0 0  
Total (before tax effects) $ (2) $ (1)