Earnings per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per common share
Net income attributable to XPO	$ 419	$ 422	$ 340
Series A preferred stock dividends	(3)	(3)	(3)
Non-cash allocation of undistributed earnings	(37)	(29)	(25)
Net income attributable to common shares, basic	$ 379	$ 390	$ 312
Basic weighted-average common shares (in shares)	96	123	115
Basic earnings per share (in usd per share)	$ 3.95	$ 3.17	$ 2.72
Diluted earnings per common share
Interest from Convertible Senior Notes	$ 0	$ 0	$ 1
Net income attributable to common shares, diluted	$ 379	$ 390	$ 313
Dilutive effect of Convertible Senior Notes (in shares)	0	0	2
Dilutive effect of non-participating stock-based awards and equity forward (in shares)	10	12	11
Diluted weighted-average common shares (in shares)	106	135	128
Diluted earnings per share (in usd per share)	$ 3.57	$ 2.88	$ 2.45
Potential common shares excluded (in shares)	10	10	10