Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Income Taxes) (Details)

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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Line Items]      
Approximate amount by which basis of assets and liabilities for tax reporting purposes is higher (lower) than amount reported on consolidated balance sheet $ 18    
Common Shares      
Income Tax Disclosure [Line Items]      
Ordinary income 33.30% 45.10% 54.40%
Long-term capital gain 57.30% 54.90% 45.60%
Return of capital 9.40% 0.00% 0.00%