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Retirement Benefits (Status Of The Company Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of prepaid (accrued) pension cost:      
Non-current benefit asset $ 102 $ 128  
U.S. Pension Benefit Plans      
Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 4,304 4,536  
Service cost 0 0 $ 0
Interest cost 182 193 370
Plan amendments 0 0  
Settlements/curtailments 0 0  
Actuarial loss (gain) 256 (319)  
Foreign exchange valuation adjustment 0 0  
Employee contributions 0 0  
Expenses and tax payments 0 0  
Benefit payments (98) (106)  
Benefit obligation at December 31 4,644 4,304 4,536
Change in Plan Assets [Roll Forward]      
Fair value at January 1 3,130 3,317  
Return on plan assets 160 (84)  
Company contributions 3 3  
Settlements 0 0  
Employee contributions 0 0  
Foreign exchange valuation adjustment 0 0  
Expenses and tax payments 0 0  
Benefit payments (98) (106)  
Fair value at December 31 3,195 3,130 3,317
Funded status of the plan (1,449) (1,174)  
Unrecognized net loss 2,054 1,777  
Unrecognized prior service benefit 0 0  
Prepaid pension cost 605 603  
Components of prepaid (accrued) pension cost:      
Current benefit liability (3) 0  
Non-current benefit liability (1,446) (1,174)  
Non-current benefit asset 0 0  
Deferred income taxes 762 657  
Accumulated other comprehensive loss 1,292 1,120  
Non U.S. Pension Benefit Plans      
Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 1,815 2,075  
Service cost 11 12 15
Interest cost 55 66 80
Plan amendments 0 (1)  
Settlements/curtailments (103) (5)  
Actuarial loss (gain) 359 (151)  
Foreign exchange valuation adjustment (293) (118)  
Employee contributions 0 2  
Expenses and tax payments (7) (5)  
Benefit payments (46) (62)  
Benefit obligation at December 31 1,791 1,815 2,075
Change in Plan Assets [Roll Forward]      
Fair value at January 1 1,696 1,806  
Return on plan assets 309 33  
Company contributions 8 10  
Settlements (103) 0  
Employee contributions 0 2  
Foreign exchange valuation adjustment (292) (88)  
Expenses and tax payments (7) (5)  
Benefit payments (46) (62)  
Fair value at December 31 1,565 1,696 1,806
Funded status of the plan (226) (119)  
Unrecognized net loss 559 453  
Unrecognized prior service benefit 0 0  
Prepaid pension cost 333 334  
Components of prepaid (accrued) pension cost:      
Current benefit liability 0 0  
Non-current benefit liability (251) (224)  
Non-current benefit asset 25 105  
Deferred income taxes 57 46  
Accumulated other comprehensive loss 502 407  
Postretirement Health Care Benefits Plan      
Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 192 212  
Service cost 0 1 2
Interest cost 4 8 10
Plan amendments (70) 0  
Settlements/curtailments 0 0  
Actuarial loss (gain) (27) (12)  
Foreign exchange valuation adjustment 0 0  
Employee contributions 0 0  
Expenses and tax payments 0 0  
Benefit payments (16) (17)  
Benefit obligation at December 31 83 192 212
Change in Plan Assets [Roll Forward]      
Fair value at January 1 143 163  
Return on plan assets 6 (6)  
Company contributions 0 0  
Settlements 0 0  
Employee contributions 0 0  
Foreign exchange valuation adjustment 0 0  
Expenses and tax payments 0 0  
Benefit payments (13) (14)  
Fair value at December 31 136 143 $ 163
Funded status of the plan 53 (49)  
Unrecognized net loss 75 104  
Unrecognized prior service benefit (67) (24)  
Prepaid pension cost 61 31  
Components of prepaid (accrued) pension cost:      
Current benefit liability 0 0  
Non-current benefit liability 0 (49)  
Non-current benefit asset 53 0  
Deferred income taxes 4 31  
Accumulated other comprehensive loss $ 4 $ 49