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INVESTMENTS AND RESTRICTED CASH - Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, Amortized Cost | $ 114 | $ 139
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 114 | 139
Available-for-sale Securities, Amortized Cost Basis | 383 | 674
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 6 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (4)
Available-for-sale Securities, Current | 389 | 671
Marketable Securities, Amortized Cost, Total | 497 | 813
Marketable Securities, Gross Unrealized Gain | 6 | 1
Marketable Securities, Gross Unrealized Loss | 0 | (4)
Marketable securities | 503 | 810
U.S. government and agency debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 191 | 297
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (1)
Available-for-sale Securities, Current | 193 | 297
Mortgage and asset-backed debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 46 | 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 | 47 | 81
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 112 | 137
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 112 | 137
Available-for-sale Securities, Amortized Cost Basis | 130 | 275
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (2)
Available-for-sale Securities, Current | 133 | 273
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 2 | 2
Debt Securities, Trading, and Equity Securities, FV-NI | 2 | 2
Non-U.S. government debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 16 | 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 | $ 16 | $ 20

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