Customer Financing (Financing Receivable Balances Evaluated For Impairment) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Customer Financing [Abstract]
Individually evaluated for impairment	$ 77	$ 55
Collectively evaluated for impairment	1,964	2,234
Total financing receivables	$ 2,041	$ 2,289

Customer Financing [Abstract]

No definition available.

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- Definition

Includes outstanding notes receivable and the net amount due as of the balance sheet date on direct financing and sales-type leases. Represents an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date.

+ References

No definition available.

+ Details

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

+ Details

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