Postretirement Plans - Schedule of Changes in the Benefit Obligation, Plan Assets and Funded Status of Pensions and OPB (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2020	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Company contribution	$ 3,000	$ 3,000
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Accrued pension plan liability, net			$ (6,141)	$ (9,104)
Pension
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance			75,635	82,415
Service cost			3	3	$ 3
Interest cost			2,080	1,988	2,455
Amendments			1
Actuarial (gain)/loss			(17,605)	(3,249)
Settlement/other				(870)
Gross benefits paid			(4,971)	(4,653)
Exchange rate adjustment			(26)	1
Ending balance		82,415	55,117	75,635	82,415
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value			67,813	68,696
Actual return on plan assets			(13,141)	4,477
Company contribution			2	11
Settlement payments				(870)
Benefits paid			(4,824)	(4,502)
Exchange rate adjustment			(25)	1
Ending balance at fair value		68,696	49,825	67,813	68,696
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets			987	1,426
Accrued liabilities			(138)	(144)
Accrued pension plan liability, net			(6,141)	(9,104)
Net amount recognized			(5,292)	(7,822)
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance			4,092	4,693
Service cost			72	87	89
Interest cost			98	97	130
Actuarial (gain)/loss			(914)	(401)
Gross benefits paid			(406)	(411)
Subsidies			39	26
Exchange rate adjustment			(3)	1
Ending balance		4,693	2,978	4,092	4,693
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance at fair value			172	160
Actual return on plan assets			(27)	21
Plan participants' contributions			6	6
Benefits paid			(11)	(15)
Ending balance at fair value		$ 160	140	172	$ 160
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets			21
Accrued liabilities			(356)	(392)
Accrued retiree health care			(2,503)	(3,528)
Net amount recognized			$ (2,838)	$ (3,920)