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Equity Level 4 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 27, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Class of Warrant or Right [Line Items]
Stock Repurchase Program, Authorized Amount		$ 4,375
Treasury stock acquired		8.4
Payments for Repurchase of Common Stock		$ 350	$ 250
Warrants outstanding		4.3		4.4
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 9.230		$ 9.264
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		980.0
Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants Exercised		0.2	0.6
Treasury Stock [Member]
Class of Warrant or Right [Line Items]
Treasury Stock, Value, Acquired, Cost Method		$ 350	$ 250
Common Stock [Member]
Class of Warrant or Right [Line Items]
Treasury stock acquired		8,394.0	6,128.0
Subsequent Event [Member]
Class of Warrant or Right [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 105
Treasury stock acquired	2.3

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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Number of warrants or rights outstanding.

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The cash outflow to reacquire common stock during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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