Goodwill and Other Intangible Assets and Liablities Intangible Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 2,013		$ 2,013
Amortized intangible assets, accumulated amortization	975		899
Amortized intangible liabilities, gross carrying amount	2,056		2,056
Amortized intangible liabilities, accumulated amortization	905		842
Amortization of Intangible Assets	76	77
Amortization of Intangible Liabilities	63	70
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible assets, Remainder of 2013	230
Amortization of intangible liabilities, Remainder of 2013	189
Amortization of intangible assets, 2014	306
Amortization of intangible liabilities, 2014	179
Amortization of intangible assets, 2015	54
Amortization of intangible liabilities, 2015	115
Amortization of intangible assets, 2016	31
Amortization of intangible liabilities, 2016	101
Amortization of intangible assets, 2017	31
Amortization of intangible liabilities, 2017	$ 96