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Debt (Fair Value of Debt) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Payable, Fair Value Disclosure	$ 5,801	$ 5,863
Subsidiaries Notes Disclosure	1,050	1,075
Notes Payable, Other Payables, Disclosure	1,661	1,599
Loans Payable, Fair Value Disclosure	2,486	2,489
Debt Excluding Capital Leases	10,998	11,026
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes Payable, Fair Value Disclosure	5,304	5,303
Subsidiaries Notes Disclosure	980	978
Notes Payable, Other Payables, Disclosure	1,691	1,629
Loans Payable, Fair Value Disclosure	2,456	2,463
Debt Excluding Capital Leases	$ 10,431	$ 10,373

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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