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Debt and Capital Leases - Midwest Generation (Details) - USD ($) $ in Millions	Apr. 07, 2016	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt		$ 6,691		$ 9,494
Non Recourse Debt
Debt Instrument [Line Items]
Long-term debt		168		2,312
Non Recourse Debt | Midwest Generation, due 2019
Debt Instrument [Line Items]
Interest rate, stated percentage			4.39%
Long-term debt		$ 48		$ 152
Midwest Generation | Non Recourse Debt
Debt Instrument [Line Items]
Proceeds from sale of unforced capacity	$ 253
Interest rate, stated percentage	4.39%

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Amount of cash inflow from the sale of other assets as part of operating activities.

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