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Basis of Presentation - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,432		$ 2,065
Restricted cash:
Prepaid expenses and other	1,354		1,244
Other assets	108		188
Cash, cash equivalents and restricted cash	3,894	$ 6,345	$ 3,497	$ 4,111
Increase (decrease) in cash, cash equivalents and restricted cash	397	$ 2,234
Cash and cash equivalents
Restricted cash:
Increase (decrease) in cash, cash equivalents and restricted cash	367
Prepaid expenses and other
Restricted cash:
Increase (decrease) in cash, cash equivalents and restricted cash	110
Other assets
Restricted cash:
Increase (decrease) in cash, cash equivalents and restricted cash	$ (80)