Fair Value (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Carrying And Fair Values Of Other Financial Assets And Liabilities

The following tables present the fair values of our other financial assets and liabilities on March 31, 2019, and December 31, 2018, and the basis for determining their fair values:

	Carrying Value			Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Financial Assets (Liabilities)	March 31, 2019
Measured at fair value:
Marketable securities held in trust:
Cash and equivalents	$	6		$	6		$	—	$	6		$	—
Available-for-sale debt securities	143			143			—		143			—
Equity securities	50			50			50		—			—
Other investments	4			4			—		—			4
Cash flow hedges	(61		)	(61		)	—		(61		)	—
Measured at amortized cost:
Short- and long-term debt principal	(13,646		)	(13,704		)	—		(13,704		)	—

	December 31, 2018
Measured at fair value:
Marketable securities held in trust:
Cash and equivalents	$	29		$	29		$	23	$	6		$	—
Available-for-sale debt securities	121			121			—		121			—
Equity securities	52			52			52		—			—
Other investments	4			4			—		—			4
Cash flow hedges	(69		)	(69		)	—		(69		)	—
Measured at amortized cost:
Short- and long-term debt principal	(12,518		)	(12,346		)	—		(12,346		)	—