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Fair Value Measurements - Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Derivatives | $ 23 | $ 27
Liabilities |  |
Derivatives | 106 | 85
Equity securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 39 | 79
Mutual funds |  |
Assets |  |
Fair value of investments measured on recurring basis | 917 | 856
U.S. Government securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 116 | 113
Other securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 170 | 151
Other commingled funds |  |
Liabilities |  |
Assets measured at NAV | 19 | 0
Level 1 |  |
Assets |  |
Derivatives | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Level 1 | Equity securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 39 | 79
Level 1 | Mutual funds |  |
Assets |  |
Fair value of investments measured on recurring basis | 917 | 856
Level 1 | U.S. Government securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 0 | 0
Level 1 | Other securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 0 | 0
Level 2 |  |
Assets |  |
Derivatives | 23 | 27
Liabilities |  |
Derivatives | 106 | 85
Level 2 | Equity securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 0 | 0
Level 2 | Mutual funds |  |
Assets |  |
Fair value of investments measured on recurring basis | 0 | 0
Level 2 | U.S. Government securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 116 | 113
Level 2 | Other securities |  |
Assets |  |
Fair value of investments measured on recurring basis | $ 170 | $ 151

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