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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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-Name Accounting Standards Codification
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