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Contingencies (Guarantees and Other Similar Matters Narrative) (Details)
Sep. 30, 2021
USD ($)
Loss Contingencies [Line Items]  
Contingent liability related to performance surety bonds $ 24,000,000
Letter of Credit [Member]  
Loss Contingencies [Line Items]  
Credit line available under the agreement 48,000,000
Revolving Credit Facility [Member] | Credit Agreement [Member]  
Loss Contingencies [Line Items]  
Credit line available under the agreement $ 3,000,000,000