Earnings Per Share (Stock Repurchase Activity) (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Shares
Treasury stock, beginning (in shares) | shares	7.7
Treasury stock, acquired (in shares) | shares	1.4
Treasury stock, ending (in shares) | shares	9.0
Cost
Treasury stock, cost, beginning | $	$ 408
Treasury stock, cost, acquired | $	110
Treasury stock, cost, ending | $	$ 519
Average Price Per Share
Treasury stock, average price per share, beginning (in usd per share) | $ / shares	$ 53.43
Treasury stock, average price per share, acquired (in usd per share) | $ / shares	80.60
Treasury stock, average price per share, ending (in usd per share) | $ / shares	$ 57.55