Stockholders' Equity and Noncontrolling Interests Preferred and Common Stock (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014 Votes	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2012	Dec. 02, 2013
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	2,000,000,000			2,000,000,000
Common Stock, Shares Authorized	5,000,000,000			5,000,000,000
Common Stock, Shares, Issued	1,600,000,000	1,500,000,000		1,600,000,000		1,500,000,000
Common Stock, Shares, Outstanding	1,600,000,000	1,500,000,000		1,600,000,000		1,500,000,000
Common Stock Dividend per Annum	$ 1.20
Dividends Paid, Common Shares	$ 1,928,000,000	$ 0	$ 0
Common Stock Voting Rights Number of Votes per Share	1			1
Stock Repurchased During Period, Equity Impact			5,109,000,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued	0	156,000,000		0		156,000,000
Preferred Stock, Shares Outstanding	0	156,000,000		0		156,000,000
Liquidation Preference Per Share	$ 25.00			$ 25.00
Preferred Stock Dividend per Annum	9.00%
Dividends Paid, Preferred Shares	1,160,000,000	1,370,000,000	621,000,000
Payments for Repurchase of Preferred Stock				3,900,000,000	3,200,000,000
Charges related to preferred shares redemption				809,000,000	816,000,000
Stock Redeemed or Called During Period, Shares					120,000,000
Percent of Preferred Stock Purchased to Shares Outstanding					43.50%
Percent Of Liquidation Amount					108.10%
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Liquidation Preference Per Share		$ 50.00				$ 50.00
Preferred Stock Dividend per Annum		4.75%
Dividends Paid, Preferred Shares		237,000,000	238,000,000
Conversion of Stock, Shares Converted						100,000,000
Conversion Rate of Preferred Stock to Common									1.3736
Shares Issued Upon Conversion of Preferred Stock						137,000,000
Common Stock Trading Days		40 days
Common Stock [Member]
Class of Stock [Line Items]
Common Shares Repurchased During Period							5,000,000
Stock Repurchased During Period, Shares								200,000,000
Stock Repurchased During Period, Price per Share							$ 33.69	$ 27.50
Purchase and Retirement of Common Stock								5,500,000,000
Share Price Prior to Common Stock Repurchase								$ 25.49
Stock Repurchased During Period, Equity Impact			2,000,000					5,100,000,000
Premium Paid on Repurchase of Common Stock								$ 402,000,000
Shares issued for the settlement of restricted stock and salary stock awards			1,300,000
Shares issued for exercised warrants			400,000