Assets and Liabilities of Businesses Held For Sale and Discontinued Operations (Summarized financial information) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	$ 2,700	$ 711
Liabilities of Assets Held-for-sale	206	345
Cash and Cash Equivalents [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	99	149
Loans and Finance Receivables [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	2,406	412
Property, Plant and Equipment, Net [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	38	81
Other 1 [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	157	69
Assets, Total [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	2,700	711
Short-term Debt [Member]
Financial Information For Businesses Held For Sale [Line Items]
Liabilities of Assets Held-for-sale	186	252
Liabilities Other [Member]
Financial Information For Businesses Held For Sale [Line Items]
Liabilities of Assets Held-for-sale	20	93
Liabilities, Total [Member]
Financial Information For Businesses Held For Sale [Line Items]
Liabilities of Assets Held-for-sale	$ 206	$ 345