Retirement Plans and Profit Sharing Arrangements - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans
Net periodic benefit cost, location	General and administrative expense	General and administrative expense	General and administrative expense
Pension Plans
Components of net periodic benefit cost
Service cost	$ 29	$ 43	$ 45
Interest cost	65	39	21
Expected return on plan assets	(76)	(70)	(57)
Amortization of prior service credits	(1)	(1)	(2)
Amortization of net loss	0	18	23
Other	3	3	5
Net periodic benefit cost	$ 20	$ 32	$ 35