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Basis of Presentation - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 7,706		$ 4,194
Restricted cash:
Prepaid expenses and other	303		319
Other assets	147		122
Cash, cash equivalents and restricted cash	8,156	$ 5,387	$ 4,635	$ 3,497
Increase / (Decrease) in cash, cash equivalents and restricted cash	3,521	$ 1,890
Cash and cash equivalents
Restricted cash:
Increase / (Decrease) in cash, cash equivalents and restricted cash	3,512
Prepaid expenses and other
Restricted cash:
Increase / (Decrease) in cash, cash equivalents and restricted cash	(16)
Other assets
Restricted cash:
Increase / (Decrease) in cash, cash equivalents and restricted cash	$ 25