Cash and Cash Equivalents, Investments, and Fair Value Measurements - Schedule of Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair value measurements
Cash and cash equivalents	$ 1,200	$ 1,706
Total	1,987	2,399
Level 1
Fair value measurements
Cash and cash equivalents	1,200	1,706
Total	1,200	1,706
Level 2
Fair value measurements
Cash and cash equivalents	0	0
Total	787	693
Level 3
Fair value measurements
Cash and cash equivalents	0	0
Total	0	0
Investment securities
Fair value measurements
Short-term investments	787	693
Investment securities | Level 1
Fair value measurements
Short-term investments	0	0
Investment securities | Level 2
Fair value measurements
Short-term investments	787	693
Investment securities | Level 3
Fair value measurements
Short-term investments	0	0
Cash
Fair value measurements
Cash and cash equivalents	574	906
Cash | Level 1
Fair value measurements
Cash and cash equivalents	574	906
Cash | Level 2
Fair value measurements
Cash and cash equivalents	0	0
Cash | Level 3
Fair value measurements
Cash and cash equivalents	0	0
Cash equivalents
Fair value measurements
Cash and cash equivalents	626	800
Cash equivalents | Level 1
Fair value measurements
Cash and cash equivalents	626	800
Cash equivalents | Level 2
Fair value measurements
Cash and cash equivalents	0	0
Cash equivalents | Level 3
Fair value measurements
Cash and cash equivalents	$ 0	$ 0