Acquisitions - Total Consideration and Net Assets Acquired (Details) - USD ($) $ in Millions	Aug. 30, 2021	Aug. 09, 2021	Mar. 11, 2020
L&M
Total consideration and net assets acquired
Total consideration, net of cash	$ 62
Less: Working capital adjustment	0
Plus: Cash acquired in acquisition	0
Net assets acquired; investing cash outflow	$ 62
Pacific Pipe
Total consideration and net assets acquired
Total consideration, net of cash		$ 104
Less: Working capital adjustment		0
Plus: Cash acquired in acquisition		2
Net assets acquired; investing cash outflow		$ 106
R&B
Total consideration and net assets acquired
Total consideration, net of cash			$ 207
Less: Working capital adjustment			(1)
Plus: Cash acquired in acquisition			3
Net assets acquired; investing cash outflow			$ 209