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Fair Value Measurements - Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Derivatives	$ 18	$ 22
Liabilities
Derivatives	23	61
Mutual funds
Assets
Fair value of investments measured on recurring basis	1,363	978
U.S. Government securities
Assets
Fair value of investments measured on recurring basis	99	105
Other securities
Assets
Fair value of investments measured on recurring basis	319	144
Level 1
Assets
Derivatives	0	0
Liabilities
Derivatives	0	0
Level 1 | Mutual funds
Assets
Fair value of investments measured on recurring basis	1,363	978
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	171	28
Level 2
Assets
Derivatives	18	22
Liabilities
Derivatives	23	61
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	99	105
Level 2 | Other securities
Assets
Fair value of investments measured on recurring basis	148	116
NAV | Other commingled funds
Liabilities
Assets measured at NAV	$ 19	$ 18

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- Definition

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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