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Debt and Capital Leases - Midwest, CVSR and Capistrano Financing (Details) - USD ($) $ in Millions	Jul. 15, 2016	Jul. 13, 2016	Apr. 07, 2016	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument
Long-term debt				$ 16,633	$ 16,704
Cedro Hill, Broken Bow, & Crofton Bluffs
Debt Instrument
Credit facility increased borrowing capacity		$ 312
Proceeds from lines of credit		$ 87
Non Recourse Debt
Debt Instrument
Long-term debt				$ 9,451	8,909
Non Recourse Debt | Midwest Generation, due 2019
Debt Instrument
Interest rate, stated percentage				4.39%
Long-term debt				$ 152	$ 231
Non Recourse Debt | CVSR Financing Agreement
Debt Instrument
Interest rate, stated percentage	4.68%
Senior notes issued	$ 200
Net proceeds from notes	$ 199
Midwest Generation | Non Recourse Debt
Debt Instrument
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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