Schedule of Derivative Assets and Liabilities by Counterparty (Details) $ in Millions	Dec. 31, 2020 USD ($)
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	$ 201
Toronoto-Dominion [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	1
Royal Bank of Canada [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	9
Bank Of Montreal [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	15
Credit Agricole
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	16
Macquarie Bank
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	15
Morgan Stanley Capital Group [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	16
Wells Fargo Bank [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	17
Merrill Lynch [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	18
Scotia Bank [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	25
Citibank [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	49
Jp Morgan Chase [Member]
Schedule of Derivative Assets and Liabilities by Counterparty [Line Items]
Net Liabilities	$ 20