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Basis of Presentation - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,365		$ 2,065
Restricted cash:
Prepaid expenses and other	1,341		1,244
Other assets	202		188
Cash, cash equivalents and restricted cash	3,908	$ 3,907	$ 3,497	$ 4,111
Increase in cash, cash equivalents and restricted cash	411	$ (204)
Cash and cash equivalents
Restricted cash:
Increase in cash, cash equivalents and restricted cash	300
Prepaid expenses and other
Restricted cash:
Increase in cash, cash equivalents and restricted cash	97
Other assets
Restricted cash:
Increase in cash, cash equivalents and restricted cash	$ 14