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Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Marketable Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | $ 115 | $ 139
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 115 | 139
Available-for-sale Securities, Amortized Cost Basis | 596 | 674
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (2) | (4)
Available-for-sale Securities, Current | 597 | 671
Total Amortized Cost | 711 | 813
Marketable Securities, Gross Unrealized Gain | 3 | 1
Marketable Securities, Gross Unrealized Loss | (2) | (4)
Total Estimated Fair Value | 712 | 810
Corporate debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 113 | 137
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 113 | 137
Available-for-sale Securities, Amortized Cost Basis | 210 | 275
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (2)
Available-for-sale Securities, Current | 210 | 273
U.S. government and agency debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 293 | 297
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (1)
Available-for-sale Securities, Current | 293 | 297
Mortgage and asset-backed debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 73 | 82
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (1)
Available-for-sale Securities, Current | 74 | 81
Equity securities |  |
Schedule of Marketable Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 2 | 0
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 2 | 0
Non-U.S. government debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 20 | 20
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | $ 20 | $ 20

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