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v3.20.2

Organization and Basis of Presentation (Details 2) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables from customers |  |
Customers | $ 1,091 | $ 1,221
Billed |  |
Receivables from customers |  |
Customers | 564 | 686
Unbilled |  |
Receivables from customers |  |
Customers | $ 527 | $ 535

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