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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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