Discontinued Operations - Financial Information for Discontinued Operations (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]
Loss from discontinued operations, net of tax	$ 0	$ 0	$ (424)
Discontinued Operations, Held-for-sale [Member] | European Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue			474
Interest expense			79
Other expenses			263
Total costs and expenses			342
Income from discontinued operations before income taxes			132
Loss on sale of discontinued operations before income taxes			525
Loss from discontinued operations before income taxes			(393)
Income tax provision			31
Loss from discontinued operations, net of tax			$ (424)