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Pension and Other Postretirement Benefits (Schedule of Projected and Changes in Benefit Obligations) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Projected Benefit Obligations        
Curtailments $ 14      
Other Postretirement Benefits        
Projected Benefit Obligations        
Benefit obligations at beginning of period 147 $ 147 $ 168  
Service cost   1 4 $ 0
Interest cost   6 6 6
Amendments   6 0  
Actuarial loss   14 (15)  
Benefits paid   (13) (13)  
Foreign currency translation   3 (3)  
Benefit obligations at end of period   164 147 168
U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period 1,371 1,371 1,499  
Service cost   15 17 14
Interest cost   50 47 50
Plan participants’ contributions   0 0  
Amendments   (1) 0  
Settlements   0 0  
Curtailments   0 0  
Actuarial loss   133 (83)  
Acquisitions   0 0  
Benefits paid   (128) (109)  
Foreign currency translation   0 0  
Benefit obligations at end of period   1,440 1,371 1,499
Plan Assets        
Balance at beginning of period 1,012 1,012 1,220  
Actual return on plan assets   244 (102)  
Employer contributions   3 3  
Plan participants’ contributions   0 0  
Settlements   0 0  
Acquisitions   0 0  
Benefits paid   (128) (109)  
Foreign currency translation   0 0  
Balance at end of period     1,012 1,220
Funded status   (309) (359)  
Accumulated benefit obligations at end of period   1,397 1,327  
Fair value of plan assets   1,131 1,012  
Non-U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period 3,102 3,102 3,507  
Service cost   15 26 22
Interest cost   71 75 75
Plan participants’ contributions   2 4  
Amendments   0 0  
Settlements   (152) (121)  
Curtailments   (18) 0  
Actuarial loss   242 (199)  
Acquisitions   0 148  
Benefits paid   (152) (150)  
Foreign currency translation   110 (188)  
Benefit obligations at end of period   3,220 3,102 3,507
Plan Assets        
Balance at beginning of period $ 3,264 3,264 3,665  
Actual return on plan assets   373 (39)  
Employer contributions   19 16  
Plan participants’ contributions   2 4  
Settlements   (152) (121)  
Acquisitions   0 90  
Benefits paid   (152) (150)  
Foreign currency translation   126 (201)  
Balance at end of period   3,480 3,264 $ 3,665
Funded status   260 162  
Accumulated benefit obligations at end of period   3,182 3,009  
Fair value of plan assets   $ 187 $ 167