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Basis of Presentation and Summary of Significant Accounting Policies - Contract Assets, Unearned Income and Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Contract assets	$ 177	$ 191	$ 0
Contract with Customer, Asset, Net, Noncurrent	7	2
Contract with Customer, Liability, Current	112	128
Contract with Customer, Liability, Noncurrent	32	46	54
Contract with Customer, Asset, Net	40	19
Accounts Receivable, Net, Current	$ 782	$ 908	$ 1,114

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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