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Basis of Presentation - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 4,210		$ 2,605
Restricted cash:
Prepaid expenses and other	1,298		1,343
Other assets	152		163
Cash, cash equivalents and restricted cash	5,660	$ 3,587	$ 4,111	$ 4,161
Increase (decrease) in cash, cash equivalents and restricted cash	1,549	$ (574)
Cash and cash equivalents
Restricted cash:
Increase (decrease) in cash, cash equivalents and restricted cash	1,605
Prepaid expenses and other
Restricted cash:
Increase (decrease) in cash, cash equivalents and restricted cash	(45)
Other assets
Restricted cash:
Increase (decrease) in cash, cash equivalents and restricted cash	$ (11)