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	Jun. 30, 2026	Dec. 31, 2025
Debt Securities
Cash equivalents:	$ 159	$ 485
Amortized Cost	223	205
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(1)	0
Fair Value	222	207
Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	101	96
Fair Value	0	0
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	58	389
Fair Value	222	207
Level 2 \| Corporate bonds
Debt Securities
Amortized Cost	33	34
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	33	34
Level 2 \| Agency securities
Debt Securities
Amortized Cost	7	11
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	7	11
Level 2 \| U.S. treasuries
Debt Securities
Amortized Cost	179	160
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(1)	0
Fair Value	178	162
Level 2 \| Certificate of deposit
Debt Securities
Amortized Cost	4
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	4
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	33	34
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| Agency securities
Debt Securities
Fair Value	7	11
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| U.S. treasuries
Debt Securities
Fair Value	178	162
Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent \| Certificate of deposit
Debt Securities
Fair Value	4
Money market mutual funds \| Level 1
Debt Securities
Cash equivalents:	137	483
Money market mutual funds \| Level 1 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	101	96
Money market mutual funds \| Level 1 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	36	387
U.S. treasuries \| Level 2
Debt Securities
Cash equivalents:	22	2
U.S. treasuries \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:CashAndCashEquivalentsAtCarryingValue
Debt Securities
Cash equivalents:	0	0
U.S. treasuries \| Level 2 \| Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndInvestmentsCurrent
Debt Securities
Cash equivalents:	$ 22	$ 2

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