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Revenue Recognition Schedule of Impact to Consolidated Financial Statement Line Items (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | $ 14,144 | $ 13,705 | $ 13,058
Costs of sales | 4,421 | 4,345 | 3,429
Operating Income | 3,794 | 3,529 | 3,538
Natural gas sales [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 3,281 | 3,053 | 2,454
Services [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 7,931 | 7,901 | 8,146
Product sales and other [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 2,932 | $ 2,751 | $ 2,458
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 14,743 |  |
Costs of sales | 5,020 |  |
Operating Income | 3,794 |  |
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] | Natural gas sales [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 3,339 |  |
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] | Services [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 8,134 |  |
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] | Product sales and other [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | 3,270 |  |
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | (599) |  |
Costs of sales | (599) |  |
Operating Income | 0 |  |
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] | Natural gas sales [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | (58) |  |
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] | Services [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | (203) |  |
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] | Product sales and other [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Total Revenues | $ (338) |  |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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