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Commitments and Contingencies - Operating Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Coal, Gas and Transportation Commitments |  |  |  |
Out-of-market contracts, net |  | $ 121 | $ 129 |
Future commitments under coal, gas and transportation contractual agreements |  |  |  |
Future minimum sublease rentals |  | 29 |  |
Powerton and Joliet |  |  |  |
Future commitments under coal, gas and transportation contractual agreements |  |  |  |
2019 |  | 1 |  |
2020 |  | 1 |  |
2021 |  | 3 |  |
2022 |  | 6 |  |
2023 |  | 6 |  |
Thereafter |  | 222 |  |
Total |  | 239 |  |
Other Leased Property |  |  |  |
Coal, Gas and Transportation Commitments |  |  |  |
Lease expense |  | 66 | $ 69 | $ 85
Future commitments under coal, gas and transportation contractual agreements |  |  |  |
2019 |  | 60 |  |
2020 |  | 55 |  |
2021 |  | 43 |  |
2022 |  | 40 |  |
2023 |  | 39 |  |
Thereafter |  | 95 |  |
Total | [1] | $ 332 |  |
EME Project Financings |  |  |  |
Coal, Gas and Transportation Commitments |  |  |  |
Leased Interest |  | 100.00% |  |
Out-of-market contracts, net |  |  |  | $ 159
Lease expense |  | $ 14 |  |
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- Definition This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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