Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and liabilities measured and recorded at fair value on a recurring basis consisted of the following (in millions):

	December 31, 2018						December 31, 2017
	Total		Level 1		Level 2		Total		Level 1		Level 2
Assets
Mutual funds	$	978	$	978	$	—	$	917	$	917	$	—
U.S. Government securities	105		—		105		116		—		116
Other securities	144		28		116		209		39		170
Derivatives	22		—		22		23		—		23
Liabilities
Derivatives	61		—		61		106		—		106
Assets measured at NAV
Other commingled funds	18						19