Capital Stock (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2021	Jan. 31, 2021	Apr. 30, 2020	Jul. 31, 2019
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			12,000,000,000
Common stock, dividend increase, percentage	4.70%
Cash dividends declared (USD per share)	$ 0.90	$ 0.86	$ 3.52	$ 3.40	$ 3.28
Common stock, dividend rate, annual, per share (USD per share)			$ 3.60
Stock repurchase program, authorized amount				$ 0
July 2019 Share Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount									$ 1,000,000,000
Stock repurchase program, rescinded authorized repurchase amount								$ 500,000,000
January 2021 Share Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 3,500,000,000	$ 2,000,000,000
Amount remaining in the share repurchased program			$ 1,825,000,000
Serial Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			10,000,000
Preferred stock, par value (USD per share)			$ 1.00
Preferred stock, shares issued (in shares)			0
Share-based Payment Arrangement [Member]
Class of Stock [Line Items]
Shares of common stock reserved for stock-based awards (in shares)			27,585,919