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Investment in Securities - Summary of Fair Value, Amortized Cost and Gross Unrealized Holding Gains and Losses of Securities (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018
Available For Sale Securities [Line Items] |  |
Available-for sale securities - fair value | $ 102 | $ 266
Amortized cost | 103 |
Gross unrealized holding gains | 19 |
Gross unrealized holding losses | 20 |
Other Current Assets [Member] |  |
Available For Sale Securities [Line Items] |  |
Available-for sale securities - fair value | 14 | 2
Other Non-current Assets [Member] |  |
Available For Sale Securities [Line Items] |  |
Available-for sale securities - fair value | 83 | 61
Money Markets [Member] |  |
Available For Sale Securities [Line Items] |  |
Available-for sale securities - fair value | $ 5 | $ 203

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity 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 No definition available. + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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