Shareholders' Equity Dividends (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended			6 Months Ended
	Apr. 17, 2017	Jan. 17, 2017	Oct. 17, 2016	Jul. 15, 2016	Mar. 31, 2017	Dec. 30, 2016	Jan. 01, 2016	Dec. 30, 2016	Jan. 01, 2016
Dividends Payable [Line Items]
Dividends Payable, Date Declared						Nov. 03, 2016
Cash dividends declared per share						$ 0.50	$ 0.50	$ 1.00	$ 1.00
Dividends Payable, Date of Record						Dec. 30, 2016
Dividends, Common Stock, Cash			$ 143	$ 142
Subsequent Event [Member]
Dividends Payable [Line Items]
Dividends Payable, Date Declared					Feb. 01, 2017
Cash dividends declared per share					$ 0.50
Dividends Payable, Date to be Paid	Apr. 17, 2017	Jan. 17, 2017
Dividends Payable, Date of Record					Mar. 31, 2017
Dividends, Common Stock, Cash		$ 144