Amounts 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.

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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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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of.

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Accounts Receivable and Finance Receivables - Accounts receivable (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Dec. 30, 2017
Accounts Receivable
Total	$ 1,121
Manufacturing group
Accounts Receivable
Accounts Receivable, Gross	1,146		$ 1,390
Allowance for doubtful accounts	(25)		(27)
Total	1,121		1,363
Manufacturing group \| Commercial
Accounts Receivable
Accounts Receivable, Gross	931		1,007
Manufacturing group \| U. S. Government Contracts, including foreign military sales
Accounts Receivable
Accounts Receivable, Gross	215		$ 383
Effect of adoption of ASC 606 \| ASC 606
Accounts Receivable
Total	163	$ (203)
Tools and Test Equipment \| Held-for-sale
Accounts Receivable
Accounts receivable, net	$ 71