Condensed Consolidated Statements of Income (Loss) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 5,036	$ 3,502	$ 9,810	$ 7,366
Cost of transportation and services	2,514	1,641	4,842	3,539
Direct operating expense	1,682	1,370	3,338	2,730
Sales, general and administrative expense	594	632	1,182	1,157
Operating income (loss)	246	(141)	448	(60)
Other income	(24)	(21)	(50)	(39)
Foreign currency (gain) loss	3	3	1	(5)
Debt extinguishment loss	0	0	8	0
Interest expense	63	82	132	154
Income (loss) before income tax provision (benefit)	204	(205)	357	(170)
Income tax provision (benefit)	46	(71)	81	(61)
Net income (loss)	158	(134)	276	(109)
Net (income) loss attributable to noncontrolling interests	(2)	3	(5)	1
Net income (loss) attributable to XPO	156	(131)	271	(108)
Net income (loss) attributable to common shares, basic	156	(132)	271	(110)
Net income (loss) attributable to common shares, diluted	$ 156	$ (132)	$ 271	$ (110)
Earnings per share data
Basic earnings (loss) per share (in dollars per share)	$ 1.39	$ (1.45)	$ 2.48	$ (1.20)
Diluted earnings (loss) per share (in dollars per share)	$ 1.38	$ (1.45)	$ 2.40	$ (1.20)
Weighted-average common shares outstanding
Basic weighted-average common shares outstanding (in shares)	112	91	109	92
Diluted weighted-average common shares outstanding (in shares)	113	91	113	92