Employee Benefits - Schedule of Net Periodic Benefit (Income) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets	$ (287)	$ (329)
Combined Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	25	44	$ 56
Interest cost	270	194	201
Expected return on plan assets	(287)	(385)	(535)
Settlement charges	0	0	383
Realized to gain on sale of businesses	0	546	0
Special termination benefits charge	2	0	6
Recognition of prior service credit	(7)	(10)	(9)
Recognition of actuarial loss	104	122	184
Net periodic pension expense	107	511	286
Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	5	10	14
Interest cost	103	72	47
Realized to gain on sale of businesses	0	(32)	0
Recognition of prior service credit	(8)	8	15
Recognition of actuarial loss	(20)	(4)	4
Net periodic pension expense	$ 80	$ 54	$ 80