Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total Current Tax Expense (Recovery)	$ 7	$ 0	$ 10	$ (156)
Total Deferred Tax Expense (Recovery)	58	0	50	(20)
Income Tax Expense (Recovery)	$ 65	$ 0	$ 60	$ (176)
Effective Tax Rate	4.60%	0.00%	5.10%	244.40%
United States [Member]
Total Current Tax Expense (Recovery)	$ 7	$ 0	$ 10	$ 0
Total Deferred Tax Expense (Recovery)	17	0	0	0
Canada [Member]
Total Current Tax Expense (Recovery)	0	0	0	(156)
Total Deferred Tax Expense (Recovery)	$ 41	$ 0	$ 50	$ (20)