Fair Value Measurements (Tables)

9 Months Ended

Sep. 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)	September 30, 2020		Level 1		Level 2		Level 3
Cash equivalents	$	13,554	$	13,554	$	—	$	—
Restricted cash equivalents	1,868		1,868		—		—
Short-term investments
U.S. Government securities	5,048		3,694		1,354		—
Long-term investments	1,310		846		230		234
Hedge derivatives, net
Fuel hedge contracts	(3)		—		(3)		—
Interest rate contracts	25		—		25		—
Foreign currency exchange contracts	(2)		—		(2)		—

(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