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Benefit Plans (Movements in Other Comprehensive Earnings/Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amortization:      
Net loss $ 163 $ 184 $ 263
Prior service cost/credit (25) (23) (38)
Other expense (income):      
Net loss 10 16 13
Prior service cost/credit 0 (4) 3
Deferred income taxes (37) (44) (61)
Amounts reclassified to net earnings as components of net periodic benefit cost 111 129 180
Other movements during the year:      
Net loss (448) (203) (74)
Prior service cost/credit (6) (1) (77)
Deferred income taxes 115 51 39
Other movements (339) (153) (509)
Total movements in other comprehensive earnings/losses (228) (24) (329)
Benefit Plans [Member]      
Other movements during the year:      
Adoption of ASU No. 2018-02     (397)
Pension [Member]      
Amortization:      
Net loss 134 159 225
Prior service cost/credit 5 6 4
Other expense (income):      
Net loss 10 20 13
Prior service cost/credit 0 1 3
Deferred income taxes (37) (47) (61)
Amounts reclassified to net earnings as components of net periodic benefit cost 112 139 184
Other movements during the year:      
Net loss (268) (153) (336)
Prior service cost/credit (5) 0 (26)
Deferred income taxes 69 38 91
Other movements (204) (115) (601)
Total movements in other comprehensive earnings/losses (92) 24 (417)
Pension [Member] | Benefit Plans [Member]      
Other movements during the year:      
Adoption of ASU No. 2018-02     (330)
Postretirement Benefit Plan [Member]      
Amortization:      
Net loss 10 5 21
Prior service cost/credit (30) (30) (42)
Other expense (income):      
Net loss 0 0 0
Prior service cost/credit 0 (5) 0
Deferred income taxes 5 7 4
Amounts reclassified to net earnings as components of net periodic benefit cost (15) (23) (17)
Other movements during the year:      
Net loss (162) (67) 264
Prior service cost/credit (1) (1) (45)
Deferred income taxes 41 18 (54)
Other movements (122) (50) 110
Total movements in other comprehensive earnings/losses (137) (73) 93
Postretirement Benefit Plan [Member] | Benefit Plans [Member]      
Other movements during the year:      
Adoption of ASU No. 2018-02     (55)
Postemployment Retirement Benefits [Member]      
Amortization:      
Net loss 19 20 17
Prior service cost/credit 0 1 0
Other expense (income):      
Net loss 0 (4) 0
Prior service cost/credit 0 0 0
Deferred income taxes (5) (4) (4)
Amounts reclassified to net earnings as components of net periodic benefit cost 14 13 13
Other movements during the year:      
Net loss (18) 17 (2)
Prior service cost/credit 0 0 (6)
Deferred income taxes 5 (5) 2
Other movements (13) 12 (18)
Total movements in other comprehensive earnings/losses $ 1 $ 25 (5)
Postemployment Retirement Benefits [Member] | Benefit Plans [Member]      
Other movements during the year:      
Adoption of ASU No. 2018-02     $ (12)