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Fair Value Measurements - Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Derivatives | $ 22 | $ 23
Liabilities |  |
Derivatives | 61 | 106
Mutual funds |  |
Assets |  |
Fair value of investments measured on recurring basis | 978 | 917
U.S. Government securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 105 | 116
Other securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 144 | 209
Level 1 |  |
Assets |  |
Derivatives | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Level 1 | Mutual funds |  |
Assets |  |
Fair value of investments measured on recurring basis | 978 | 917
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 | 28 | 39
Level 2 |  |
Assets |  |
Derivatives | 22 | 23
Liabilities |  |
Derivatives | 61 | 106
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 | 105 | 116
Level 2 | Other securities |  |
Assets |  |
Fair value of investments measured on recurring basis | 116 | 170
NAV | Other commingled funds |  |
Liabilities |  |
Alternative Investment | $ 18 | $ 19

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