Employee Benefit Plans (Net Periodic Benefit Costs and Other Changes Recognized in OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other changes in plan assets and benefit obligations recognized in OCI:
Total recognized in OCI	$ (5)	$ 88	$ (279)
Pension Benefits
Net periodic benefit costs [Abstract]
Service costs	156	143	187
Interest costs	460	474	328
Settlement and curtailment (gains) losses	5	6	5
Expected return on plan assets	(460)	(480)	(516)
Amortization of net actuarial (gains) losses	167	159	129
Amortization of prior service costs (credit)	(11)	(11)	(11)
Total net periodic benefit costs (credit)	317	291	122
Other changes in plan assets and benefit obligations recognized in OCI:
Net actuarial (gains) losses	141	250	2
Prior service costs (credit)	3	0	8
Amortization of net actuarial (gains) losses	(167)	(159)	(129)
Amortization of prior service (costs) credit	11	11	11
Settlement and curtailment (gains) losses	(5)	(6)	(5)
Total recognized in OCI	(15)	94	(120)
Total recognized in net periodic benefit costs and OCI	302	385	2
Pension Benefits | Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments
Other changes in plan assets and benefit obligations recognized in OCI:
Total recognized in OCI	2	(2)	(7)
Other Postretirement Benefits
Net periodic benefit costs [Abstract]
Service costs	3	3	4
Interest costs	40	43	34
Settlement and curtailment (gains) losses	1	0	0
Expected return on plan assets	(56)	(54)	(55)
Amortization of net actuarial (gains) losses	(28)	(30)	(25)
Amortization of prior service costs (credit)	0	0	0
Total net periodic benefit costs (credit)	(40)	(38)	(42)
Other changes in plan assets and benefit obligations recognized in OCI:
Net actuarial (gains) losses	(20)	(41)	(191)
Prior service costs (credit)	0	0	0
Amortization of net actuarial (gains) losses	28	30	25
Amortization of prior service (costs) credit	0	0	0
Settlement and curtailment (gains) losses	(1)	0	0
Total recognized in OCI	7	(11)	(166)
Total recognized in net periodic benefit costs and OCI	(33)	(49)	(208)
Other Postretirement Benefits | Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments
Other changes in plan assets and benefit obligations recognized in OCI:
Total recognized in OCI	$ 0	$ 0	$ 0