Equity Level 4 Equity Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 24, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Stock Repurchase Program, Increase in Number of Shares Authorized to be Repurchased		$ 1,600
Stock Repurchase Program, Authorized Amount		4,375
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 1,300
Subsequent Event [Member]
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	5.3
Treasury Stock, Value, Acquired, Cost Method	$ 211