Equity Level 4 (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended				3 Months Ended	9 Months Ended		1 Months Ended	3 Months Ended			9 Months Ended
	Jul. 29, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 31, 2014	Jun. 30, 2014	Sep. 30, 2014 Common Stock [Member]	Sep. 30, 2014 Common Stock [Member]	Sep. 30, 2013 Common Stock [Member]	Oct. 31, 2014 Subsequent Event [Member]	Sep. 30, 2014 Common Stock [Member]	Sep. 30, 2014 Accelerated Share Repurchase Program [Member]	Sep. 30, 2014 Accelerated Share Repurchase Program [Member] Additional Paid-in Capital [Member]	Sep. 30, 2013 Accelerated Share Repurchase Program [Member] Additional Paid-in Capital [Member]	Sep. 30, 2014 Accelerated Share Repurchase Program [Member] Treasury Stock [Member]
Class of Warrant or Right [Line Items]
Stock Repurchase Program, Increase in Number of Shares Authorized to be Repurchased				$ 775
Stock Repurchase Program, Authorized Amount							2,775
Accelerated Share Repurchases, Settlement (Payment) or Receipt						525
Stock Repurchased During Period, Shares													3,500,000
accelerated share repurchase total shares repurchased												14,700,000
Accelerated Share Repurchases, Cash or Stock Settlement				Under the terms of the ASR, the actual per share purchase price and the total number of shares to be repurchased will be based on the VWAP of the Company’s common stock during the term of the ASR, less a discount and subject to certain adjustments. If the total number of shares to be repurchased is less than the initial delivery, the Company may elect to return cash or shares (limited to an established maximum number of shares); and if the total number of shares to be repurchased is greater than the initial delivery, the Company will receive shares in settlement. Increases in the VWAP decrease the total number of shares repurchased and decreases in the VWAP increase the total number of shares repurchased.
Treasury Stock, Value, Acquired, Cost Method	82	0		1,365												394
Treasury stock acquired								20,100,000	39,066,000	12,680,000	2,300,000		11,200,000
Stock Repurchased During Period, Value														131	0
Payments for Repurchase of Common Stock		$ 0		$ 1,496	$ 375
Warrants outstanding		8,400,000		8,400,000
Common Stock, Dividends, Per Share, Declared		$ 0.18	$ 0.15	$ 0.48	$ 0.35
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 9.418		$ 9.418