Retirement Plans and Profit Sharing Arrangements - Reconciliation of Changes in Fair Value of Assets (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Change in fair value of plan assets
Fair value of plan assets, beginning	$ 1,142	$ 1,583
Actual return on plan assets	136	(365)
Employer contributions	56	56
Benefits paid	(23)	(21)
Settlements	(45)	(27)
Foreign currency rate changes	26	(84)
Fair value of plan assets, ending	$ 1,292	$ 1,142