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Revenue Recognition - Customer Receivables and Contract Balances (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Customer receivables	$ 518	$ 631
Contract liabilities	207	238
Contract assets	64	68
Gross customer receivables	554	669
Allowance for doubtful accounts	$ 36	$ 38

X

- Definition

Revenue from Contract with Customer, Liability, ASC 606 Portion

+ References

No definition available.

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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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