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Pension and Other Postretirement Benefits (Schedule of Projected and Changes in Benefit Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S. Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligations at beginning of period $ 1,501 $ 1,601  
Service cost 14 14 $ 13
Interest cost 50 63 66
Plan participants’ contributions 0 0  
Amendments 3 0  
Settlements (39) (5)  
Actuarial (gain) / loss 54 (69)  
Acquisitions 0 0  
Benefits paid (101) (103)  
Foreign currency translation 0 0  
Benefit obligations at end of period 1,482 1,501 1,601
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance at beginning of period 1,190 1,300  
Actual return on plan assets 65 (9)  
Employer contributions 41 7  
Plan participants’ contributions 0 0  
Settlements (39) (5)  
Acquisitions 0 0  
Benefits paid (101) (103)  
Foreign currency translation 0 0  
Balance at end of period 1,156 1,190 1,300
Funded Status (326) (311)  
Accumulated benefit obligations at end of period 1,446 1,463  
Non-U.S. Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligations at beginning of period 3,493 3,750  
Service cost 21 24 23
Interest cost 101 127 154
Plan participants’ contributions 3 3  
Amendments 0 0  
Settlements 0 0  
Actuarial (gain) / loss 382 (62)  
Acquisitions 0 82  
Benefits paid (172) (190)  
Foreign currency translation (545) (241)  
Benefit obligations at end of period 3,283 3,493 3,750
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance at beginning of period 3,169 3,410  
Actual return on plan assets 611 48  
Employer contributions 62 72  
Plan participants’ contributions 3 3  
Settlements 0 0  
Acquisitions 0 40  
Benefits paid (172) (190)  
Foreign currency translation (521) (214)  
Balance at end of period 3,152 3,169 3,410
Funded Status (131) (324)  
Accumulated benefit obligations at end of period 3,191 3,387  
Other Postretirement Benefits [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligations at beginning of period 171 241  
Service cost 0 1 2
Interest cost 6 7 12
Amendments 0 (52)  
Actuarial (gain) / loss 7 (19)  
Acquisitions 0 20  
Curtailment 0 (3)  
Benefits paid (15) (17)  
Foreign currency translation (2) (7)  
Benefit obligations at end of period 167 171 $ 241
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid $ (15) $ (17)