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Postretirement Benefits (Changes In Postretirement Benefit Obligation, Plan Assets, Funded Status And Amounts Recognized In Balance Sheet And Accumulated Other Comprehensive (Loss) Income) (Details) - Other Postretirement Benefits Plan [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Domestic Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, January 1 $ 280 $ 275  
Service cost 1 1 $ 1
Interest cost 11 11 11
Participants' contributions 5 5  
Actuarial (gain) loss 14 31  
Plan amendments 0 0  
Benefits Paid (42) (44)  
Federal subsidy 1 1  
Currency impact 0 0  
Benefit obligation, December 31 270 280 275
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, January 1 0 0  
Company contributions 37 39  
Participants' contributions 5 5  
Benefits paid (42) (44)  
Fair value of plan assets, December 31 0 0 0
Funded status, December 31 (270) (280)  
Current liability (28) (29)  
Non-current liability (242) (251)  
Amounts recognized in the consolidated balance sheet (270) (280)  
Net actuarial loss (gain) 74 68  
Prior service credit (6) (8)  
Amounts recognized in accumulated other comprehensive income (pre-tax) 68 60  
Foreign Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, January 1 23 45  
Service cost 0 0 1
Interest cost 2 3 5
Participants' contributions 0 0  
Actuarial (gain) loss 2 5  
Plan amendments 0 (35)  
Benefits Paid (2) (1)  
Federal subsidy 0 0  
Currency impact 0 6  
Benefit obligation, December 31 25 23 45
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, January 1 0 0  
Company contributions 2 1  
Participants' contributions 0 0  
Benefits paid (2) (1)  
Fair value of plan assets, December 31 0 0 $ 0
Funded status, December 31 (25) (23)  
Current liability (1) (2)  
Non-current liability (24) (21)  
Amounts recognized in the consolidated balance sheet (25) (23)  
Net actuarial loss (gain) 19 21  
Prior service credit (30) (34)  
Amounts recognized in accumulated other comprehensive income (pre-tax) $ (11) $ (13)