Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Net periodic benefit costs [Abstract]
Service costs	$ 48	$ 58	$ 150	$ 177
Interest costs	81	89	244	250
Curtailment (gains) losses			0	(17)
Expected return on plan assets	(128)	(124)	(386)	(381)
Amortization of net actuarial (gains) losses	31	38	92	115
Amortization of prior service costs (credit)	(4)	(6)	(10)	(11)
Net periodic benefit costs (credit)	28	55	90	133
Other Postretirement Benefits
Net periodic benefit costs [Abstract]
Service costs	2	2	4	4
Interest costs	8	9	25	27
Curtailment (gains) losses			0	0
Expected return on plan assets	(13)	(14)	(41)	(42)
Amortization of net actuarial (gains) losses	(7)	(6)	(19)	(33)
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs (credit)	$ (10)	$ (9)	$ (31)	$ (44)