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Basis of Presentation and Recent Developments Basis of Presentation and Recent Developments (Details) - USD ($) $ in Millions | Feb. 14, 2020 | Feb. 27, 2020 | Dec. 31, 2019
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Leases not yet commenced, liability |  |  | $ 14
Subsequent Event |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Leases not yet commenced, liability |  | $ 115 |
Subsequent Event | Sloane and Company LLC |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from divestiture of businesses | $ 26 |  |
Payment period | 2 years |  |
Gain on disposition of business | $ 16 |  |

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