Retirement and Deferred Compensation Plans - Fair Value of Benefit Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 81	$ 86
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23	33
U.S. government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22	17
CMBS
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	22
Cash and invested cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	3
Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10	$ 9