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Financial Instruments - Investment Securities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, amortized cost	$ 375	$ 391
Available-for-sale, gross unrealized gains	1	2
Available-for-sale, gross unrealized losses	0	0
Available-for-sale, estimated fair value	376	393
Non-U.S. debt securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, amortized cost	309	310
Available-for-sale, gross unrealized gains	1	2
Available-for-sale, gross unrealized losses	0	0
Available-for-sale, estimated fair value	310	312
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, amortized cost	66	81
Available-for-sale, gross unrealized gains	0	0
Available-for-sale, gross unrealized losses	0	0
Available-for-sale, estimated fair value	$ 66	$ 81

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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-Publisher FASB
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-Section S99
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

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