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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, 2015 USD ($)
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | $ 357
Less Than 12 Months Unrealized Losses | 6
12 Months or More Fair Value | 78
12 Months or More Unrealized Losses | 2
Total Fair Value | 435
Total Unrealized Losses | 8
U.S. government and agency debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 168
Less Than 12 Months Unrealized Losses | 1
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 168
Total Unrealized Losses | 1
Mortgage and asset-backed debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 0
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 28
12 Months or More Unrealized Losses | 1
Total Fair Value | 28
Total Unrealized Losses | 1
Corporate debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 0
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 50
12 Months or More Unrealized Losses | 1
Total Fair Value | 50
Total Unrealized Losses | 1
U.S. state and local municipal debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 0
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 0
Total Unrealized Losses | 0
Equity securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 0
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 0
Total Unrealized Losses | 0
Non-U.S. government debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 0
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 0
Total Unrealized Losses | 0
Carbon credit investments |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 189
Less Than 12 Months Unrealized Losses | 5
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 189
Total Unrealized Losses | 5
Other debt securities |
Gain (Loss) on Investments [Line Items] |
Less Than 12 Months Fair Value | 0
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 0
Total Unrealized Losses | $ 0

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