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Debt (Fair Value of Debt) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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Portion at Fair Value, Fair Value Disclosure [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Notes Payable, Fair Value Disclosure | $ 5,418 | $ 5,317 | ||||
| Loans Payable, Fair Value Disclosure | 2,826 | 2,845 | ||||
| Notes Payable, Other Payables, Disclosure | 1,751 | [1] | 1,772 | [1] | ||
| Subsidiaries Term Loan | 1,590 | 1,179 | ||||
| Debt Excluding Capital Leases | 11,585 | 11,113 | ||||
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Carrying (Reported) Amount, Fair Value Disclosure [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Notes Payable, Fair Value Disclosure | 4,989 | 4,989 | ||||
| Loans Payable, Fair Value Disclosure | 2,821 | 2,828 | ||||
| Notes Payable, Other Payables, Disclosure | 1,743 | [1] | 1,766 | [1] | ||
| Subsidiaries Term Loan | 1,607 | 1,191 | ||||
| Debt Excluding Capital Leases | $ 11,160 | $ 10,774 | ||||
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