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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Other Commitments [Line Items]  
Commitments under coal, gas and transportation contractual agreements
As of December 31, 2016, the Company's commitments under such outstanding agreements are as follows:
Period
(In millions)
2017
$
638

2018
251

2019
174

2020
140

2021
109

Thereafter
415

Total
$
1,727


Minimum purchase commitment obligations under purchased power agreements
Minimum purchase commitment obligations are as follows as of December 31, 2016:
Period
(In millions)
2017
$
25

2018
17

2019
13

2020
11

2021
21

Thereafter

Total (a)
$
87


(a)
As of December 31, 2016, the maximum remaining term under any individual purchased power contract is five years.
EME [Member]  
Other Commitments [Line Items]  
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, 2016, are as follows:
Period
(In millions)
2017
$
1

2018
1

2019
1

2020
1

2021
3

Thereafter
234

Total
$
241

REMA [Member]  
Other Commitments [Line Items]  
Future minimum lease commitments under operating leases
Future minimum lease commitments under the REMA operating leases for the years ending after December 31, 2016 are as follows:
Period
(In millions)
2017
$
63

2018
55

2019
65

2020
56

2021
47

Thereafter
231

Total
$
517

GenOn Mid-Atlantic  
Other Commitments [Line Items]  
Future minimum lease commitments under operating leases
Future minimum lease commitments under the GenOn Mid-Atlantic operating leases for the years ending after December 31, 2016 are as follows:
Period
(In millions)
2017
$
144

2018
105

2019
139

2020
105

2021
42

Thereafter
400

Total
$
935

Other Leased Property [Member]  
Other Commitments [Line Items]  
Future minimum lease commitments under operating leases
Future minimum lease commitments under operating leases for the years ending after December 31, 2016 are as follows:
Period
(In millions)
2017
$
84

2018
76

2019
67

2020
61

2021
52

Thereafter
443

Total (a)
$
783


(a) Amounts in the table exclude future sublease income of $14 million associated with long-term leases for office locations.