Dispositions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from the dispositions, net	$ 49	$ 0	$ 281
Gain (Loss) on Disposition of Business	44	0	(240)
Notes Assumed	$ 0	$ 0	75
HAI JV Disposition [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposition purchase price			136
HAI Cash			2
Proceeds from the dispositions			61
Notes Assumed			75
HAI Gain on Disposition			120
PAC Disposition [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
gross cash consideration			226
Liabilities transferred, net of cash			6
PAC post closing adjustment to purchase price			1
PAC Gain on Disposition			120
Pre-tax Income of Affiliate			$ 14