Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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)	June 30, 2020		Level 1		Level 2		Level 3
Cash equivalents	$	8,225	$	8,225	$	—	$	—
Restricted cash equivalents	452		452		—		—
Short-term investments
U.S. Government securities	4,302		4,244		58		—
Long-term investments	1,384		924		226		234
Hedge derivatives, net
Fuel hedge contracts	(6)		—		(6)		—
Interest rate contracts	26		—		26		—
Foreign currency exchange contracts	6		—		6		—

(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