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Financial Instruments and Fair Value Measurements - (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis The following tables summarize our financial instruments by significant categories and fair value measurement on a recurring basis as of September 30, 2021 and December 31, 2020.
(in millions)
Level 1
Level 2
Total
September 30, 2021
Cash equivalents:
Money market mutual funds$2 $— $2 
U.S. treasuries
— 3 3 
Total cash equivalents
2 3 5 
Investments:
Asset-backed securities
— 48 48 
Corporate bonds
— 140 140 
U.S. government agencies and government-sponsored agencies
— 2 2 
U.S. treasuries
— 122 122 
Other debt securities
— 10 10 
Total investments
— 322 322 
Restricted cash equivalents:
Money market mutual funds
95 — 95 
U.S. treasuries— 1 1 
Total restricted cash equivalents
95 1 96 
Restricted investments:
Corporate bonds— 32 32 
U.S. government agencies and government-sponsored agencies— 16 16 
   U.S. treasuries— 179 179 
Certificate of deposit
— 12 12 
Total restricted investments
— 239 239 
Total cash equivalents and investments and restricted cash equivalents and investments$97 $565 $662 
(in millions)Level 1Level 2Total
December 31, 2020
Cash equivalents
Money market mutual funds$2 $— $2 
U.S. treasuries— 11 11 
Total cash equivalents2 11 13 
Investments
Asset-backed securities— 24 24 
Corporate bonds— 93 93 
U.S. government agencies and government-sponsored agencies— 5 5 
U.S. treasuries— 67 67 
Other debt securities— 6 6 
Total investments— 195 195 
Restricted cash equivalents:
Money market mutual funds99 — 99 
Total restricted cash equivalents99 — 99 
Restricted investments:
Corporate bonds— 35 35 
U.S. government agencies and government-sponsored agencies— 23 23 
U.S. treasuries— 198 198 
Total restricted investments— 256 256 
Total investments and restricted cash equivalents and investments$101 $462 $563