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Redeemable Noncontrolling Interests and Total Equity (Preferred Stock) (Details) (USD $)
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3 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | |||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2012
Series A Preferred Stock
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Dec. 31, 2011
Series A Preferred Stock
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Jun. 30, 2011
Series B Preferred Stock
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Oct. 13, 2008
Series B Preferred Stock
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Dec. 31, 2012
Series B Preferred Stock
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Oct. 13, 2008
Series C Preferred Stock
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Dec. 31, 2012
Series C Preferred Stock
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Dec. 31, 2012
Series C Preferred Stock
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Dec. 31, 2009
Series C Preferred Stock
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Dec. 31, 2011
Series C Preferred Stock
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Oct. 13, 2008
Series B and C Preferred Stock
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Jul. 31, 2006
Depositary Shares
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Dec. 31, 2012
Depositary Shares
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| Class of Stock [Line Items] | |||||||||||||||
| Preferred stock dividend rate | 10.00% | 10.00% | 10.00% | ||||||||||||
| Shares Outstanding | 44,000 | 519,882 | 519,882 | ||||||||||||
| Liquidation preference (per share) | $ 25,000 | $ 1,000 | $ 1,000 | $ 1,000 | |||||||||||
| Carrying Value | $ 1,508,000,000 | $ 1,508,000,000 | $ 1,100,000,000 | $ 1,100,000,000 | $ 8,100,000,000 | $ 408,000,000 | $ 408,000,000 | $ 408,000,000 | |||||||
| Preferred Stock, Other Disclosures | |||||||||||||||
| Stock issued during the period (in shares) | 7,839,209 | 1,160,791 | 44,000,000 | ||||||||||||
| Stock purchase price | 9,000,000,000 | 1,100,000,000 | |||||||||||||
| Preferred stock redemption price (per share) | $ 25,000 | $ 1,100 | $ 1,100 | $ 25 | |||||||||||
| Preferred stock dividend declared (per share) | $ 255.56 | $ 25.00 | |||||||||||||
| Proceeds from issuance of preferred stock | 8,100,000,000 | 900,000,000 | 9,000,000,000 | ||||||||||||
| Stock purchase price (per share) | $ 784 | ||||||||||||||
| Stock redeemed (in shares) | 640,909 | ||||||||||||||
| Stock redeemed, value | $ 700,000,000 | ||||||||||||||