Employee Benefit Plans - Components of Net Periodic Pension Benefit (Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Interest Cost	$ (117)	$ (103)	$ (97)
Expected return on plan assets	124	156	165
Remeasurement gain (loss)	(223)	201	237
Net periodic pension benefit (cost)	$ (216)	$ 254	$ 305