Commitments and Contingencies - Contingencies (Details) £ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)
Commitments and Contingencies Disclosure [Abstract]
Loss contingency accrual	$ 1,600		$ 1,000
Non-income tax matters	614		336
Value tax assessment	$ 733	£ 613	$ 789	£ 631