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Label Element Value
Fair Value, Recurring [Member] | Money Market Funds [Member]  
Restricted Cash Equivalents us-gaap_RestrictedCashEquivalents $ 99,000,000
Restricted Cash Equivalents us-gaap_RestrictedCashEquivalents 93,000,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]  
Restricted Cash Equivalents us-gaap_RestrictedCashEquivalents 93,000,000
Restricted Cash Equivalents us-gaap_RestrictedCashEquivalents 99,000,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]  
Restricted Cash Equivalents us-gaap_RestrictedCashEquivalents 0
Restricted Cash Equivalents us-gaap_RestrictedCashEquivalents $ 0