Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Basic earnings per common share
Net income attributable to XPO	$ 23	$ 47
Series A preferred stock dividends	(1)	(1)
Non-cash allocation of undistributed earnings	(1)	(3)
Net income attributable to common shares, basic	$ 21	$ 43
Basic weighted-average common shares (in shares)	92	107
Basic earnings per share (in dollars per share)	$ 0.23	$ 0.40
Diluted earnings per common share
Net income attributable to common shares, diluted	$ 21	$ 43
Basic weighted-average common shares (in shares)	92	107
Dilutive effect of non-participating stock-based awards and equity forward (in shares)	11	10
Diluted weighted-average common shares (in shares)	103	117
Diluted earnings per share (in dollars per share)	$ 0.20	$ 0.37
Potential common shares excluded (in shares)	10	10