Shareholders' Equity Narrative (Details) - USD ($) $ / shares in Units, $ in Billions	Dec. 31, 2021	Dec. 31, 2020
Preferred Stock, No Par Value	$ 0
Common Stock, Shares Authorized	1,000,000,000
Preferred Stock, Shares Authorized	500,000
Common Stock, No Par Value	$ 0
Preferred Stock, Shares Issued	0
Treasury Stock, Shares	156,600,000	160,000,000
Treasury Stock, Value	$ 0.3
Common Stock [Member]
Treasury Stock, Value	$ 5.1	$ 5.2
Reinvested Earnings [Member]
Treasury Stock, Value		$ 0.3