Cash, Cash Equivalents, and Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash, Cash Equivalents, and Short-term Investments	$ 6,378	$ 7,309
Total cash and cash equivalents	7,451	9,272
Restricted Cash	93	88
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	7,544	9,360	$ 8,950	$ 10,795
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	1,073	1,963
Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	781	706
US Government [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	33	854
Marketable securities	258	185
US Government Agencies [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	100	400
Marketable securities	0	0
Debt Security, Government, Non-US [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	710	370
Marketable securities	82	79
Corporate debt [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	230	339
Marketable securities	253	252
Other Debt Obligations [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities	$ 188	$ 190