Leases - Components of Operating Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 42	$ 49	$ 87
Variable lease cost	25	33	48
Sublease income	(33)	(39)	(43)
Total operating lease costs, net	34	43	92
Cash paid for amounts included in the measurement of operating lease liabilities	71	79	129
ROU assets recognized for new operating lease liabilities	$ 337	$ 2	$ 0