Equity ~Treasury Stock, Value (Details) - USD ($) $ / shares in Thousands, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		$ 1,000	$ 1,000
Treasury Stock, Shares, Acquired	1.1	0.5	1.6
Treasury Stock, Value, Acquired, Cost Method	$ 63	$ 27	$ 90
Treasury Stock Acquired, Average Cost Per Share	$ 58,500	$ 53,840
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 910	$ 973	$ 973