Benefit Plans (Movements in Other Comprehensive Earnings/Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amortization:
Net loss	$ 163	$ 163	$ 184
Prior service cost/credit	(41)	(25)	(23)
Other expense (income):
Net loss	0	10	16
Prior service cost/credit	0	0	(4)
Deferred income taxes	(30)	(37)	(44)
Amounts reclassified to net earnings as components of net periodic benefit cost	92	111	129
Other movements during the year:
Net loss	624	(448)	(203)
Prior service cost/credit	337	(6)	(1)
Deferred income taxes	(245)	115	51
Other movements	716	(339)	(153)
Total movements in other comprehensive earnings/losses	808	(228)	(24)
Pension [Member]
Amortization:
Net loss	131	134	159
Prior service cost/credit	5	5	6
Other expense (income):
Net loss	0	10	20
Prior service cost/credit	0	0	1
Deferred income taxes	(35)	(37)	(47)
Amounts reclassified to net earnings as components of net periodic benefit cost	101	112	139
Other movements during the year:
Net loss	465	(268)	(153)
Prior service cost/credit	(8)	(5)	0
Deferred income taxes	(118)	69	38
Other movements	339	(204)	(115)
Total movements in other comprehensive earnings/losses	440	(92)	24
Postretirement Benefit Plan [Member]
Amortization:
Net loss	22	10	5
Prior service cost/credit	(46)	(30)	(30)
Other expense (income):
Net loss	0	0	0
Prior service cost/credit	0	0	(5)
Deferred income taxes	7	5	7
Amounts reclassified to net earnings as components of net periodic benefit cost	(17)	(15)	(23)
Other movements during the year:
Net loss	157	(162)	(67)
Prior service cost/credit	345	(1)	(1)
Deferred income taxes	(127)	41	18
Other movements	375	(122)	(50)
Total movements in other comprehensive earnings/losses	358	(137)	(73)
Postemployment Retirement Benefits [Member]
Amortization:
Net loss	10	19	20
Prior service cost/credit	0	0	1
Other expense (income):
Net loss	0	0	(4)
Prior service cost/credit	0	0	0
Deferred income taxes	(2)	(5)	(4)
Amounts reclassified to net earnings as components of net periodic benefit cost	8	14	13
Other movements during the year:
Net loss	2	(18)	17
Prior service cost/credit	0	0	0
Deferred income taxes	0	5	(5)
Other movements	2	(13)	12
Total movements in other comprehensive earnings/losses	$ 10	$ 1	$ 25