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Acquisitions, Discontinued Operations and Dispositions - Dispositions (Details) - USD ($) $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2018 | Jun. 29, 2018 | Jun. 28, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from financing arrangements |  |  |  | $ 2,048 | $ 995
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Percentage of ownership sold | 100.00% |  |  |  |
Proceeds from sale, net of working capital adjustments | $ 71 |  |  |  |
Gain on sale | 15 |  |  |  |
Cash collateral | 4 |  |  |  |
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Letter of Credit |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Guarantees | 119 |  |  |  |
BETM | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Guarantee Type, Other |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Guarantees | $ 32 |  |  |  |
Canal Three | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on sale |  | $ 17 |  |  |
Proceeds from other asset sales |  | $ 16 |  |  |
Proceeds from financing arrangements |  |  | $ 167 |  |
Proceeds distributed to Company |  |  | $ 151 |  |
Other | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from other asset sales |  |  |  | $ 22 | $ 21

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