Income Taxes - Income Tax (Benefit) Expense Attributable to Income from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Current Income Tax Expense (Benefit)	$ (57)	$ 115	$ 274
Deferred:
Total	(60)	(5)	(208)
Income tax expense (benefit)	(117)	110	66
Canadian
Current:
Canadian	(284)	16	45
Deferred:
Canadian	20	32	(67)
United States
Current:
U.S. Federal	105	(10)	125
U.S. state, net of federal income tax benefit	26	25	26
Deferred:
U.S. Federal	(79)	(37)	(82)
U.S. state, net of federal income tax benefit	(9)	(7)	(27)
Other Foreign
Current:
Canadian	96	84	78
Deferred:
Canadian	$ 8	$ 7	$ (32)