Employee Benefit Plans - Components of Net Periodic (Benefit) Cost (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
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	153	146	459	437
Expected return on plan assets	(330)	(381)	(990)	(1,142)
Amortization of prior service credit	0	0	0	0
Recognized net actuarial loss	64	88	191	266
Settlements	0	1	0	1
Net periodic (benefit) cost	(113)	(146)	(340)	(438)
Other Postretirement and Postemployment Benefits
Defined Benefit Plan Disclosure
Service cost	18	21	53	64
Interest cost	32	29	96	88
Expected return on plan assets	(4)	(9)	(12)	(26)
Amortization of prior service credit	(1)	(2)	(4)	(5)
Recognized net actuarial loss	13	15	41	42
Settlements	0	0	0	0
Net periodic (benefit) cost	$ 58	$ 54	$ 174	$ 163