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Commitments and Contingencies Purchase Obligations and Operating Lease Commitment Tables (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Consolidated operating leases future minimum payments due |  |  |
2019 | $ 196 |  |
2020 | 175 |  |
2021 | 152 |  |
2022 | 134 |  |
2023 | 85 |  |
Thereafter | 235 |  |
Future minimum payments under operating leases | 977 |  |
Rent expense | 168 | $ 155 | $ 136
Energy Segment |  |  |
Unconditional purchase obligations |  |  |
2019 | 129 |  |
2020 | 89 |  |
2021 | 78 |  |
2022 | 76 |  |
2023 | 75 |  |
Thereafter | 444 |  |
Minimum required payments for unconditional purchase obligations | 891 |  |
Amounts purchased under supply agreements | $ 214 | $ 209 | $ 151

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