Employee Benefit Plans (Net Periodic Costs (Income)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Non-operating expense
Non-service pension income	$ (366)	$ (386)
Pension
Operating expense
Service cost	42	47
Non-operating expense
Interest cost	583	596
Expected return on plan assets	(917)	(937)
Amortization of prior service credit	(39)	(43)
Recognized actuarial net loss	5	5
Net settlement, curtailment, and special termination benefit gain	0	(7)
Non-service pension income	(368)	(386)
Total net periodic income	$ (326)	$ (339)