Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension Benefits
Net periodic benefit costs [Abstract]
Service costs	$ 38	$ 41	$ 75	$ 81
Interest costs	119	114	238	228
Expected return on plan assets	(111)	(115)	(221)	(230)
Amortization of net actuarial (gains) losses	42	41	84	83
Amortization of prior service costs (credit)	(3)	(3)	(6)	(6)
Net periodic benefit costs (credit)	85	78	170	156
Other Postretirement Benefits
Net periodic benefit costs [Abstract]
Service costs	1	1	2	2
Interest costs	10	10	21	20
Expected return on plan assets	(7)	(14)	(21)	(28)
Amortization of net actuarial (gains) losses	(15)	(6)	(23)	(14)
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs (credit)	$ (11)	$ (9)	$ (21)	$ (20)