Assets and Liabilities of Businesses Held For Sale and Discontinued Operations (Narrative, Financial Information and NBCU) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 02, 2012 Business Property [Member]	Jul. 15, 2013 Portugal Consumer Auto Personal Loan [Member]	Sep. 30, 2012 South Korea CLL [Member]
Financial Information For Businesses Held For Sale [Line Items]
Proceeds from Sale of Real Estate Held-for-investment				$ 2,406
Summarized financial information for business held for sale
Assets Held-for-sale, at Carrying Value	50	211
Liabilities of Assets Held-for-sale	6	157
Proceeds from Divestiture of Businesses, Net of Cash Divested	528	227	8,950		83	168
Preferred Stock, Value, Issued	0	0	0
Deferred Tax Liabilities, Gross	$ 18,010	$ 17,876