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New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease ROU asset |  | $ 233 |
Operating lease liability |  | $ 240 |
Accounting Standards Update 2016-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease ROU asset |  |  | $ 207
Operating lease liability |  |  | $ 214
Accounting Standards Update 2019-05 [Member] | Forecast [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of adoption | $ 14 |  |

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