Income Taxes - Income tax activity and implications of settlement (Details) - Internal Revenue Service (IRS) - Approval of 1998 To 2008 tax years final settlement - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 01, 2016	Dec. 31, 2016
Income Taxes
Income tax benefit on continuing and discontinued operations	$ 319	$ 319
Continuing Operations
Income Taxes
Income tax benefit on continuing operations	206	206
Discontinued Operations
Income Taxes
Income tax benefit on discontinued operations	$ 113	$ 113