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CASH AND INVESTMENTS - Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Marketable Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | $ 2 | $ 114
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 2 | 114
Available-for-sale Securities, Amortized Cost Basis | 391 | 383
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 9 | 6
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 400 | 389
Total Amortized Cost | 393 | 497
Marketable Securities, Gross Unrealized Gain | 9 | 6
Marketable Securities, Gross Unrealized Loss | 0 | 0
Total Estimated Fair Value | 402 | 503
Corporate debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost |  | 112
Trading Securities, Gross Unrealized Gain |  | 0
Trading Securities, Gross Unrealized Loss |  | 0
Debt Securities, Trading, and Equity Securities, FV-NI |  | 112
Available-for-sale Securities, Amortized Cost Basis | 167 | 130
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 4 | 3
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 171 | 133
U.S. government and agency debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 180 | 191
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3 | 2
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 183 | 193
Mortgage and asset-backed debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 33 | 46
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 35 | 47
Equity securities |  |
Schedule of Marketable Securities [Line Items] |  |
Debt Securities, Trading, Amortized Cost | 2 | 2
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Debt Securities, Trading, and Equity Securities, FV-NI | 2 | 2
Non-U.S. government debt securities |  |
Schedule of Marketable Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 11 | 16
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 | $ 11 | $ 16

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