Disposal of Business Disposal of business (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 1,100
Proceeds from Divestiture of Businesses, Net of Cash Divested	1,000
Gain on disposal of business	213	$ 0	$ 0
Business Exit Costs	$ 100