Capital Stock (Schedule of Issued Repurchased and Outstanding Shares) (Details) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock, Shares Outstanding [Roll Forward]
Beginning balance, Shares Issued (in shares)	2,805,961,317	2,805,961,317	2,805,961,317
Beginning balance, Shares Repurchased (in shares)	(947,542,152)	(947,979,763)	(931,903,722)
Beginning balance, Shares Outstanding (in shares)	1,858,419,165	1,857,981,554	1,874,057,595
Stock award activity (in shares)	412,569	437,611	427,276
Repurchases of common stock (in shares)	(35,656,116)		(16,503,317)
Ending balance, Shares Issued (in shares)	2,805,961,317	2,805,961,317	2,805,961,317
Ending balance, Shares Repurchased (in shares)	(982,785,699)	(947,542,152)	(947,979,763)
Ending balance, Shares Outstanding (in shares)	1,823,175,618	1,858,419,165	1,857,981,554