Equity Equity (Share Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 101	$ 300	$ 43
Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired	546,614
Treasury Stock, Value, Acquired, Cost Method	$ 80
Treasury Stock Acquired, Average Cost Per Share	$ 146.00