Earnings Per Share, Share Repurchases and Dividends on Common Stock (Unaudited) Share Repurchases (Details 2) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		9 Months Ended		47 Months Ended
	Feb. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Feb. 29, 2020	Jun. 01, 2021	Jan. 25, 2021	Dec. 04, 2018	Sep. 16, 2015
Share Repurchases - Notes to Table
Accelerated Share Repurchase	$ 2,000
Accelerated Share Repurchase, Payment	$ 2,000
Accelerated share repurchase initial receipt shares	5.9
Accelerated Share Repurchase Initial Receipt Monetary	$ 1,700
Accelerated Share Repurchase Remaining Amount					$ 300
Accelerated Share Repurchase Final Delivery Possible Settlement Shares					0.2
Accelerated Share Repurchase Share Price					$ 327.29
September 2015 Share Repurchase Program Original Authorization
Share Repurchase [Line Items]
Amount Authorized								$ 4,000
Shares Retired				15.4
Average Cost Per Share				$ 260.33
Shares Repurchased		0.0	0.9
December 2018 Share Repurchase Original Authorization [Member]
Share Repurchase [Line Items]
Amount Authorized							$ 3,000
Shares Retired		8.6
Average Cost Per Share		$ 335.62
Shares Repurchased		8.1	0.5
Share Repurchases - Notes to Table
Shares repurchased amount		$ 2,900
Amount remaining under authorization for share repurchases		$ 100
January 2021 Share Repurchase Original Authorization [Member]
Share Repurchase [Line Items]
Amount Authorized						$ 3,000
Shares Retired		0.0
Average Cost Per Share		$ 0
Shares Repurchased		0.0	0.0