Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Stock Repurchase Program, Authorized Amount	$ 400		$ 400
Treasury Stock, Value, Acquired, Cost Method	99	$ 163	101
Proceeds from Issuance of Common Stock	$ 0	$ 481	$ 0
Stock Issued During Period, Shares, New Issues		6,172,840
Shares Issued, Price Per Share		$ 81.00
Common stock par value	$ 0.01	$ 0.01
Common Stock Issued Underwriter Option		925,926
Common Stock Price Per Share Underwriter Option		$ 81.00
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 72