Shareholders' Equity - Accelerated Share Repurchase Activity and Related Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	2 Months Ended	3 Months Ended		4 Months Ended			6 Months Ended
	Apr. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	Apr. 30, 2016
February 2017 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date	2017-05
Number of shares repurchased (in shares)	17,527
ASR amount	$ 3,000
November 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date				2017-02
Number of shares repurchased (in shares)		6,300	44,800	51,157
Average repurchase price per share (in dollars per share)				$ 117.29
ASR amount				$ 6,000
August 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date					2016-11
Number of shares repurchased (in shares)					26,850
Average repurchase price per share (in dollars per share)					$ 111.73
ASR amount					$ 3,000
May 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date						2016-08
Number of shares repurchased (in shares)						60,452
Average repurchase price per share (in dollars per share)						$ 99.25
ASR amount						$ 6,000
November 2015 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date							2016-04
Number of shares repurchased (in shares)							29,122
Average repurchase price per share (in dollars per share)							$ 103.02
ASR amount							$ 3,000