Divestitures - FS Effect (Details) - 2019 Divestitures Plan - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disposal group, disposed of by sale, not discontinued operations
Liabilities held for sale
Operating revenue		$ 36
Disposal group, held-for-sale
Assets held for sale
Trade receivables	$ 41		$ 81
Inventories	22		28
Net plant and equipment	15		48
Goodwill and intangible assets	140		166
Other	5		28
Total assets held for sale	223		351
Liabilities held for sale
Accounts payable	12		21
Accrued expenses	8		17
Other	22		33
Total liabilities held for sale	42		71
Operating revenue	$ 50	$ 51	$ 44