Financial Instruments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in the Company’s financial statements (in millions):


	March 31, 2017								December 31, 2016
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	2,164	$	2,164	$	—	$	—	$	2,179	$	2,179	$	—	$	—
Short-term investments:
Corporate debt		804		—		804		—		835		—		835		—
Asset-backed securities		757		—		757		—		792		—		792		—
Certificates of deposit placed through an account registry service (“CDARS”)		224		—		224		—		246		—		246		—
U.S. government and agency notes		101		—		101		—		140		—		140		—
Other fixed-income securities		146		—		146		—		54		—		54		—
Other investments measured at NAV		183		—		—		—		182		—		—		—
Restricted cash		129		129		—		—		124		124		—		—
Enhanced equipment trust certificates (“EETC”)		22		—		—		22		23		—		—		23

Carrying Values and Estimated Fair Values of Financial Instruments

The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions):


	Fair Value of Debt by Fair Value Hierarchy Level
	March 31, 2017										December 31, 2016
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	11,894	$	12,321	$	—	$	9,040	$	3,281	$	10,767	$	11,055	$	—	$	8,184	$	2,871