Cash, Cash Equivalents and Restricted Cash, Investments and Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair value measurements
Cash and cash equivalents	$ 1,281	$ 1,050
Total	1,291	1,278
Investment securities
Fair value measurements
Short-term investments		228
Cash
Fair value measurements
Cash and cash equivalents	913	430
Cash equivalents
Fair value measurements
Cash and cash equivalents	368	620
Certificate of deposit
Fair value measurements
Prepaid expenses and other current assets	10
Level 1
Fair value measurements
Cash and cash equivalents	1,281	1,050
Total	1,291	1,050
Level 1 | Investment securities
Fair value measurements
Short-term investments		0
Level 1 | Cash
Fair value measurements
Cash and cash equivalents	913	430
Level 1 | Cash equivalents
Fair value measurements
Cash and cash equivalents	368	620
Level 1 | Certificate of deposit
Fair value measurements
Prepaid expenses and other current assets	10
Level 2
Fair value measurements
Total	0	228
Level 2 | Investment securities
Fair value measurements
Short-term investments		228
Level 2 | Certificate of deposit
Fair value measurements
Prepaid expenses and other current assets	0
Level 3
Fair value measurements
Total	0	0
Level 3 | Investment securities
Fair value measurements
Short-term investments		$ 0
Level 3 | Certificate of deposit
Fair value measurements
Prepaid expenses and other current assets	$ 0