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Benefit Plans (Movements in Other Comprehensive Earnings/Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Amortization:        
Net loss $ 184 $ 263 $ 239  
Prior service cost/credit (23) (38) (34)  
Other expense (income):        
Net loss 16 13 86  
Prior service cost/credit (4) 3    
Deferred income taxes (44) (61) (113)  
Amounts reclassified to net earnings as components of net periodic benefit cost 129 180 178  
Other movements during the year:        
Adoption of ASU No. 2018-02       $ (397)
Net loss (203) (74) 14  
Prior service cost/credit (1) (77) 38  
Deferred income taxes 51 39 (21)  
Other movements (153)   31  
Other movements   (509)    
Total movements in other comprehensive earnings/losses (24)      
Total movements in other comprehensive earnings/losses   (329)    
Total movements in other comprehensive earnings/losses (24) 68 209  
Pension [Member]        
Amortization:        
Net loss 159 225 197  
Prior service cost/credit 6 4 4  
Other expense (income):        
Net loss 20 13 86  
Prior service cost/credit 1 3    
Deferred income taxes (47) (61) (113)  
Amounts reclassified to net earnings as components of net periodic benefit cost 139 184 174  
Other movements during the year:        
Adoption of ASU No. 2018-02       (330)
Net loss (153) (336) 81  
Prior service cost/credit 0 (26) 0  
Deferred income taxes 38 91 (32)  
Other movements (115)   49  
Other movements   (601)    
Total movements in other comprehensive earnings/losses 24      
Total movements in other comprehensive earnings/losses   (417)    
Total movements in other comprehensive earnings/losses     223  
Postretirement Benefit Plan [Member]        
Amortization:        
Net loss 5 21 25  
Prior service cost/credit (30) (42) (38)  
Other expense (income):        
Net loss 0 0 0  
Prior service cost/credit (5) 0    
Deferred income taxes 7 4 6  
Amounts reclassified to net earnings as components of net periodic benefit cost (23) (17) (7)  
Other movements during the year:        
Adoption of ASU No. 2018-02       (55)
Net loss (67) 264 (56)  
Prior service cost/credit (1) (45) 38  
Deferred income taxes 18 (54) 7  
Other movements (50)   (11)  
Other movements   110    
Total movements in other comprehensive earnings/losses (73)      
Total movements in other comprehensive earnings/losses   93    
Total movements in other comprehensive earnings/losses     (18)  
Postemployment Retirement Benefits [Member]        
Amortization:        
Net loss 20 17 17  
Prior service cost/credit 1 0 0  
Other expense (income):        
Net loss (4) 0 0  
Prior service cost/credit 0 0    
Deferred income taxes (4) (4) (6)  
Amounts reclassified to net earnings as components of net periodic benefit cost 13 13 11  
Other movements during the year:        
Adoption of ASU No. 2018-02       $ (12)
Net loss 17 (2) (11)  
Prior service cost/credit 0 (6) 0  
Deferred income taxes (5) 2 4  
Other movements 12   (7)  
Other movements   (18)    
Total movements in other comprehensive earnings/losses $ 25      
Total movements in other comprehensive earnings/losses   $ (5)    
Total movements in other comprehensive earnings/losses     $ 4