Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Benefits
Net periodic benefit costs [Abstract]
Service costs	$ 37	$ 40
Interest costs	119	114
Expected return on plan assets	(110)	(115)
Amortization of net actuarial (gains) losses	42	42
Amortization of prior service costs (credit)	(3)	(3)
Net periodic benefit costs (credit)	85	78
Other Postretirement Benefits
Net periodic benefit costs [Abstract]
Service costs	1	1
Interest costs	11	10
Expected return on plan assets	(14)	(14)
Amortization of net actuarial (gains) losses	(8)	(8)
Amortization of prior service costs (credit)	0	0
Net periodic benefit costs (credit)	$ (10)	$ (11)