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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future minimum lease commitments under operating leases

Future minimum lease commitments under the Powerton and Joliet operating leases for the years ending after December 31, 2017 are as follows:

Period	(In millions)
2018	$	1
2019	1
2020	1
2021	3
2022	6
Thereafter	228
Total	$	240

Future minimum lease commitments under operating leases for the years ending after December 31, 2017 are as follows:

Period	(In millions)
2018	$	78
2019	80
2020	75
2021	65
2022	64
Thereafter	479
Total (a)	$	841

(a) Amounts in the table exclude future sublease income of $49 million associated with long-term leases for office locations.

Commitments under coal, gas and transportation contractual agreements

As of December 31, 2017, the Company's commitments under such outstanding agreements are as follows:

Period	(In millions)
2018	$	527
2019	188
2020	150
2021	112
2022	103
Thereafter	296
Total	$	1,376

Minimum purchase commitment obligations under purchased power agreements

Minimum purchase commitment obligations are as follows as of December 31, 2017:

Period	(In millions)
2018	$	21
2019	14
2020	12
2021	11
2022	10
Thereafter	—
Total (a)	$	68

(a) As of December 31, 2017, the maximum remaining term under any individual purchased power contract is five years.

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- Definition

Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount.

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Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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Tabular disclosure of unconditional purchase obligations that are not recognized as a liability on the balance sheet, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the nature of any variable components of the obligation; the amount purchased under the obligation (for example, the take-or-pay or throughput contract) for the reporting period; and may include the amount of imputed interest necessary to reduce the obligation to present value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25287-109308

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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