Employee Benefit Plans (Components of Net Periodic Benefit Cost Included in General and Administrative Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 65	$ 82	$ 211	$ 247
Interest cost	111	91	320	273
Expected return on plan assets	(218)	(206)	(649)	(618)
Amortization of prior service cost	(1)	(1)	(1)	(3)
Amortization of actuarial (gain) loss, net	37	61	124	184
Settlements	2	1	3	3
Curtailments	0	0	0	0
Special Termination Benefits	0	0	4	1
Net periodic (benefit) cost	(4)	28	12	87
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	7	10	20
Interest cost	14	12	41	36
Expected return on plan assets	(25)	(26)	(77)	(76)
Amortization of prior service cost	(2)	2	(6)	5
Amortization of actuarial (gain) loss, net	2	4	5	12
Settlements	0	0	0	0
Curtailments	0	0	(8)	0
Special Termination Benefits	0	0	4	0
Net periodic (benefit) cost	$ (8)	$ (1)	$ (31)	$ (3)