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CASH AND INVESTMENTS - Age of Gross Unrealized Losses and Fair Value by Investment Category (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | $ 328
Less Than 12 Months Unrealized Losses | 3
12 Months or More Fair Value | 185
12 Months or More Unrealized Losses | 1
Total Fair Value | 513
Total Unrealized Losses | 4
U.S. government and agency debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 183
Less Than 12 Months Unrealized Losses | 2
12 Months or More Fair Value | 90
12 Months or More Unrealized Losses | 1
Total Fair Value | 273
Total Unrealized Losses | 3
Mortgage and asset-backed debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 36
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 25
12 Months or More Unrealized Losses | 0
Total Fair Value | 61
Total Unrealized Losses | 0
Corporate debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 101
Less Than 12 Months Unrealized Losses | 1
12 Months or More Fair Value | 70
12 Months or More Unrealized Losses | 0
Total Fair Value | 171
Total Unrealized Losses | 1
Non-U.S. government debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 8
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 8
Total Unrealized Losses | $ 0

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