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Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details) - Notes receivable
$ in Millions
Mar. 31, 2022
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 $ 0
2021 0
2020 and prior 10
Total 10
Internal grade 1  
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 0
2021 0
2020 and prior 4
Total 4
Internal grade 2  
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 0
2021 0
2020 and prior 6
Total 6
Internal grade 3  
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 0
2021 0
2020 and prior 0
Total $ 0