Divestitures - FS Effect (Details) - 2019 Divestitures Plan - Disposal group, held-for-sale - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenue	$ 123	$ 124	$ 378	$ 399
Assets held for sale
Trade receivables	95		95
Inventories	46		46
Net plant and equipment	55		55
Goodwill and intangible assets	192		192
Other	32		32
Total assets held for sale	420		420
Liabilities held for sale
Accounts payable	25		25
Accrued expenses	22		22
Other	49		49
Total liabilities held for sale	$ 96		$ 96