Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of assets (liabilities) measured at fair value on a recurring basis

Assets (Liabilities) Measured at Fair Value on a Recurring Basis

(in millions)	March 31, 2020		Level 1		Level 2
Cash equivalents	$	4,669	$	4,669	$	—
Restricted cash equivalents	494		494		—
Long-term investments	1,367		908		459
Hedge derivatives, net
Fuel hedge contracts	8		(5)		13
Interest rate contracts	25		—		25
Foreign currency exchange contracts	14		—		14

(in millions)	December 31, 2019		Level 1		Level 2
Cash equivalents	$	586	$	586	$	—
Restricted cash equivalents	847		847		—
Long-term investments	1,099		881		218
Hedge derivatives, net
Fuel hedge contracts	1		(1)		2
Interest rate contracts	61		—		61
Foreign currency exchange contracts	6		—		6