INVESTMENTS - Schedule of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis (Details) - Fair Value Measurement on a Recurring Basis - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt Securities
Cash equivalents:	$ 219	$ 485
Amortized Cost	281	205
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(5)	0
Fair Value	276	207
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	170	96
Fair Value	0	0
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	49	389
Fair Value	226	207
Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments
Debt Securities
Cash equivalents:	0
Fair Value	50
Level 2 \| Corporate bonds
Debt Securities
Amortized Cost	35	34
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Fair Value	34	34
Level 2 \| Agency securities
Debt Securities
Amortized Cost	8	11
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	8	11
Level 2 \| U.S. treasuries
Debt Securities
Amortized Cost	233	160
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(4)	0
Fair Value	229	162
Level 2 \| Certificate of deposit
Debt Securities
Amortized Cost	5
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	5
Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue \| Corporate bonds
Debt Securities
Fair Value	0	0
Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue \| Agency securities
Debt Securities
Fair Value	0	0
Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue \| U.S. treasuries
Debt Securities
Fair Value	0	0
Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue \| Certificate of deposit
Debt Securities
Fair Value	0
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| Corporate bonds
Debt Securities
Fair Value	34	34
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| Agency securities
Debt Securities
Fair Value	8	11
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| U.S. treasuries
Debt Securities
Fair Value	179	162
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| Certificate of deposit
Debt Securities
Fair Value	5
Level 2 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments \| Corporate bonds
Debt Securities
Fair Value	0
Level 2 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments \| Agency securities
Debt Securities
Fair Value	0
Level 2 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments \| U.S. treasuries
Debt Securities
Fair Value	50
Level 2 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments \| Certificate of deposit
Debt Securities
Fair Value	0
Money market mutual funds \| Level 1
Debt Securities
Cash equivalents:	154	483
Money market mutual funds \| Level 1 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	120	96
Money market mutual funds \| Level 1 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	34	387
Money market mutual funds \| Level 1 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments
Debt Securities
Cash equivalents:	0
U.S. treasuries \| Level 2
Debt Securities
Cash equivalents:	63	2
U.S. treasuries \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	50	0
U.S. treasuries \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	13	$ 2
U.S. treasuries \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments
Debt Securities
Cash equivalents:	0
Certificate of deposit \| Level 2
Debt Securities
Cash equivalents:	2
Certificate of deposit \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	0
Certificate of deposit \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	2
Certificate of deposit \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:ShortTermInvestments
Debt Securities
Cash equivalents:	$ 0

INVESTMENTS - Schedule of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis (Details) - Fair Value Measurement on a Recurring Basis - USD ($)
$ in Millions