Benefit Plans (Movements in Other Comprehensive Earnings/Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amortization:
Net loss (gain)	$ 29	$ 8	$ 127
Prior service cost (credit)	(36)	(34)	(39)
Deferred income taxes	2	8	(22)
Amounts reclassified to net earnings as components of net periodic benefit cost	(5)	(18)	66
Other movements during the year:
Net (loss) gain	141	(51)	147
Prior service (cost) credit	1	3	(2)
Deferred income taxes	(36)	9	(35)
Other movements	106	(39)	110
Total movements in other comprehensive earnings (losses)	101	(57)	176
Pension [Member]
Amortization:
Net loss (gain)	28	4	96
Prior service cost (credit)	5	6	6
Deferred income taxes	(8)	(2)	(26)
Amounts reclassified to net earnings as components of net periodic benefit cost	25	8	76
Other movements during the year:
Net (loss) gain	(5)	(60)	(183)
Prior service (cost) credit	0	0	0
Deferred income taxes	1	16	48
Other movements	(4)	(44)	(135)
Total movements in other comprehensive earnings (losses)	21	(36)	(59)
Postretirement Benefit Plan [Member]
Amortization:
Net loss (gain)	(6)	(2)	18
Prior service cost (credit)	(41)	(40)	(45)
Deferred income taxes	12	11	7
Amounts reclassified to net earnings as components of net periodic benefit cost	(35)	(31)	(20)
Other movements during the year:
Net (loss) gain	159	20	345
Prior service (cost) credit	1	3	(2)
Deferred income taxes	(40)	(10)	(87)
Other movements	120	13	256
Total movements in other comprehensive earnings (losses)	85	(18)	236
Postemployment Retirement Benefits [Member]
Amortization:
Net loss (gain)	7	6	13
Prior service cost (credit)	0	0	0
Deferred income taxes	(2)	(1)	(3)
Amounts reclassified to net earnings as components of net periodic benefit cost	5	5	10
Other movements during the year:
Net (loss) gain	(13)	(11)	(15)
Prior service (cost) credit	0	0	0
Deferred income taxes	3	3	4
Other movements	(10)	(8)	(11)
Total movements in other comprehensive earnings (losses)	$ (5)	$ (3)	$ (1)