Common Stockholders' Equity (Schedule of Changes in Shares of Common Stock Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock Shares Outstanding [Roll Forward]
Balance, beginning of year	265,170,882	266,737,725	275,117,861
Shares issued	745,612	1,062,086	1,164,816
Shares repurchased	(1,370,394)	(2,628,929)	(9,544,952)
Balance, end of year	264,546,100	265,170,882	266,737,725