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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance at beginning of period $ 0    
Balance at end of period   $ 0  
Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligations at beginning of period 168 167  
Service cost 4 0 $ 0
Interest cost 6 6 6
Actuarial loss (15) 4  
Benefits paid (13) (13)  
Foreign currency translation (3) 4  
Benefit obligations at end of period 147 168 167
U.S. Plans | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligations at beginning of period 1,499 1,482  
Service cost 17 14 14
Interest cost 47 50 50
Plan participants’ contributions 0 0  
Amendments 0 4  
Settlements 0 0  
Actuarial loss (83) 51  
Acquisitions 0 0  
Benefits paid (109) (102)  
Foreign currency translation 0 0  
Benefit obligations at end of period 1,371 1,499 1,482
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance at beginning of period 1,220 1,156  
Actual return on plan assets (102) 162  
Employer contributions 3 4  
Employer contributions 0 0  
Settlements 0 0  
Acquisitions 0 0  
Benefits paid (109) (102)  
Foreign currency translation 0 0  
Balance at end of period 1,012 1,220 1,156
Funded status (359) (279)  
Accumulated benefit obligations at end of period 1,327 1,445  
Non-U.S. Plans | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligations at beginning of period 3,507 3,283  
Service cost 26 22 21
Interest cost 75 75 101
Plan participants’ contributions 4 3  
Amendments 0 0  
Settlements (121) (7)  
Actuarial loss (199) 39  
Acquisitions 148 0  
Benefits paid (150) (214)  
Foreign currency translation (188) 306  
Benefit obligations at end of period 3,102 3,507 3,283
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Balance at beginning of period 3,665 3,152  
Actual return on plan assets (39) 134  
Employer contributions 16 290  
Employer contributions 4 3  
Settlements (121) (7)  
Acquisitions 90 0  
Benefits paid (150) (214)  
Foreign currency translation (201) 307  
Balance at end of period 3,264 3,665 $ 3,152
Funded status 162 158  
Accumulated benefit obligations at end of period $ 3,009 $ 3,418