Amortizable Intangible Assets, Net - Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 94	$ 96
Accumulated Amortization	37	33
Net	57	63
Water rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	19	19
Accumulated Amortization	10	9
Net	$ 9	10
Water rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (Years)	10 years
Water rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (Years)	40 years
Energy contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 52	52
Accumulated Amortization	23	21
Net	$ 29	31
Energy contracts | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (Years)	15 years
Energy contracts | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (Years)	25 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives (Years)	10 years
Gross Carrying Value	$ 21	23
Accumulated Amortization	4	3
Net	17	20
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2	2
Accumulated Amortization	0	0
Net	$ 2	$ 2