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Retirement Benefits - Additional Information (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
amendment
subsidy
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]        
Curtailment gain $ 0 $ 0 $ 32,000,000  
Settlement loss $ 48,000,000 26,000,000 0  
Period of market-related asset value method of recognizing assets related gains and losses 5 years      
Deferred compensation plan, employer percentage of matching 4.00%      
Deferred compensation plan, maximum employer contribution for board officers $ 50,000      
Defined contribution plan, expenses for material defined contribution plans 28,000,000 26,000,000 28,000,000  
Defined contribution plan, discretionary matching contributions made during period $ 0 0 0  
Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Period range of amortizing gains and losses recognized 11 years      
Amortization period of prior service cost 1 year      
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Period range of amortizing gains and losses recognized 34 years      
Amortization period of prior service cost 5 years      
Change in Accounting Method Accounted for as Change in Estimate        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   (28,000,000)    
U.S. | Change in Accounting Method Accounted for as Change in Estimate        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   (18,000,000)    
Non U.S. | Change in Accounting Method Accounted for as Change in Estimate        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   (6,000,000)    
Pension Benefit Plan | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Years of service required 1 year      
Additional eligible compensation after IRS limit $ 175,000      
Curtailment gain 0 0 0  
Settlement loss 0 0 0  
Amortization of unrecognized net loss and prior service cost for next fiscal year 56,000,000      
Service cost 0 0 0  
Interest cost 185,000,000 182,000,000 193,000,000  
Company contributions 3,000,000 3,000,000    
Expected future contributions, next fiscal year 500,000,000      
Net periodic pension cost 0 (1,000,000) 27,000,000  
Actuarial present value of the future death benefits 5,235,000,000 4,644,000,000 4,304,000,000  
Pension Benefit Plan | Non U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Curtailment gain 0 0 32,000,000  
Settlement loss 48,000,000 26,000,000 0  
Amortization of unrecognized net loss and prior service cost for next fiscal year 12,000,000      
Service cost 3,000,000 11,000,000 12,000,000  
Interest cost 40,000,000 55,000,000 66,000,000  
Company contributions 7,000,000 8,000,000    
Net periodic pension cost 15,000,000 10,000,000 (43,000,000)  
Actuarial present value of the future death benefits $ 1,844,000,000 1,791,000,000 1,815,000,000  
Postretirement Health Care Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Retirement age when retirees are provided an annual subsidiary to use toward the purchase of health care 65 years     65 years
Number of plan amendments | amendment 2      
Number of fixed rate subsidies | subsidy 1      
Maximum annual participant subsidy $ 560      
Curtailment gain 0 0 0  
Settlement loss $ 0 0 0  
Amortization period of prior service cost 5 years      
Amortization of unrecognized net loss and prior service cost for next fiscal year $ 10,000,000      
Service cost 0 0 1,000,000  
Interest cost 3,000,000 4,000,000 8,000,000  
Company contributions 0 0    
Net periodic pension cost (20,000,000) (27,000,000) (51,000,000)  
Actuarial present value of the future death benefits 85,000,000 83,000,000 192,000,000  
Postretirement Health Care Benefits Plan | Change in Accounting Method Accounted for as Change in Estimate        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   (4,000,000)    
Split-dollar Life Insurance Arrangement        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension cost 5,000,000 5,000,000 $ 5,000,000  
Actuarial present value of the future death benefits $ 62,000,000 $ 58,000,000