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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Projected Benefit Obligations        
Curtailments $ 14      
Actuarial loss   $ 387    
Other Postretirement Benefits        
Projected Benefit Obligations        
Benefit obligations at beginning of period 147 164 $ 147  
Service cost   1 1 $ 4
Interest cost   5 6 6
Amendments   0 6  
Actuarial loss   7 14  
Benefits paid   (11) (13)  
Foreign currency translation   0 3  
Benefit obligations at end of period   166 164 147
U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period 1,371 1,440 1,371  
Service cost   18 15 17
Interest cost   38 50 47
Plan participants’ contributions   0 0  
Amendments   1 (1)  
Settlements   (7) 0  
Curtailments   0 0  
Actuarial loss   109 133  
Benefits paid   (94) (128)  
Foreign currency translation   0 0  
Benefit obligations at end of period   1,505 1,440 1,371
Plan Assets        
Balance at beginning of period 1,012 1,131 1,012  
Actual return on plan assets   113 244  
Employer contributions   9 3  
Plan participants’ contributions   0 0  
Settlements   (7) 0  
Acquisitions   0 0  
Benefits paid   (94) (128)  
Foreign currency translation   0 0  
Balance at end of period   1,152 1,131 1,012
Fair value of plan assets   1,152 1,131  
Funded status   (353) (309)  
Accumulated benefit obligations at end of period   1,445 1,397  
Non-U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period 3,102 3,220 3,102  
Service cost   12 15 26
Interest cost   53 71 75
Plan participants’ contributions   2 2  
Amendments   0 0  
Settlements   (271) (152)  
Curtailments   0 (18)  
Actuarial loss   278 242  
Benefits paid   (151) (152)  
Foreign currency translation   102 110  
Benefit obligations at end of period   3,245 3,220 3,102
Plan Assets        
Balance at beginning of period $ 3,264 3,480 3,264  
Actual return on plan assets   334 373  
Employer contributions   18 19  
Plan participants’ contributions   2 2  
Settlements   (271) (152)  
Acquisitions   0 0  
Benefits paid   (152) (152)  
Foreign currency translation   107 126  
Balance at end of period   3,518 3,480 $ 3,264
Fair value of plan assets   191 187  
Funded status   273 260  
Accumulated benefit obligations at end of period   $ 3,177 $ 3,182