Fair Value Measurements of Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Long-term debt	$ 2,438	$ 2,414
Project Debt	124	125
Estimate of Fair Value Measurement [Member]
Assets, Fair Value Disclosure	2	13
Financial and Nonfinancial Liabilities, Fair Value Disclosure	10	10
Long-term debt	2,497	2,492
Project Debt	129	130
Reported Value Measurement [Member]
Long-term debt	2,438	2,414
Project Debt	124	125
Fair Value, Inputs, Level 1 [Member] \| Mutual And Bond Funds [Member] \| Estimate of Fair Value Measurement [Member]
Investments, Fair Value Disclosure	2	2
Energy Hedges [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Liability	3	0
Energy Hedges [Member] \| Fair Value, Inputs, Level 2 [Member] \| Estimate of Fair Value Measurement [Member]
Derivative Asset	0
Energy Hedges [Member] \| Fair Value, Inputs, Level 2 [Member] \| Energy Hedges [Member] \| Estimate of Fair Value Measurement [Member]
Derivative Asset		11
Interest Rate Swap [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Liability	$ 7	$ 10

Total project debt.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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