Assets and Liabilities of Businesses Held For Sale and Discontinued Operations (Summarized financial information) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	$ 3,039	$ 711
Liabilities of Assets Held-for-sale	283	345
Cash and Cash Equivalents [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	135	149
Loans and Finance Receivables [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	2,794	412
Property, Plant and Equipment, Net [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	56	81
Other [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	54	69
Assets, Total [Member]
Financial Information For Businesses Held For Sale [Line Items]
Assets Held-for-sale, at Carrying Value	3,039	711
Short-term Debt [Member]
Financial Information For Businesses Held For Sale [Line Items]
Liabilities of Assets Held-for-sale	223	252
Liabilities Other [Member]
Financial Information For Businesses Held For Sale [Line Items]
Liabilities of Assets Held-for-sale	60	93
Liabilities, Total [Member]
Financial Information For Businesses Held For Sale [Line Items]
Liabilities of Assets Held-for-sale	$ 283	$ 345