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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers Disaggregated Based on Type of Good) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 730 | $ 1,156 | $ 1,495 | $ 2,018
Oil, gas and NGL derivatives | 140 | (487) | (465) | (600)
Upstream revenues | 1,191 | 766 | 1,654 | 1,783
Total revenues | 1,921 | 1,922 | 3,149 | 3,801
Oil, Gas and NGL Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,051 | 1,253 | 2,119 | 2,383
Oil, Gas and NGL Sales [Member] | Oil [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 753 | 808 | 1,414 | 1,485
Oil, Gas and NGL Sales [Member] | Gas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 147 | 207 | 380 | 462
Oil, Gas and NGL Sales [Member] | NGL [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 151 | 238 | 325 | 436
Marketing Revenues [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 730 | 1,156 | 1,495 | 2,018
Marketing Revenues [Member] | Oil [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 394 | 766 | 750 | 1,297
Marketing Revenues [Member] | Gas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 172 | 160 | 390 | 315
Marketing Revenues [Member] | NGL [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 164 | $ 230 | $ 355 | $ 406

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