Other Intangible Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 2,030		$ 2,030
Amortized intangible assets, accumulated amortization	1,286		1,209
Amortized intangible liabilities, gross carrying amount	2,056		2,056
Amortized intangible liabilities, accumulated amortization	1,139		1,095
Amortization of Intangible Assets	77	76
Amortization of Intangible Liabilities	44	63
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible assets, Remainder of 2014	233
Amortization of intangible liabilities, Remainder of 2014	135
Amortization of intangible assets, 2015	56
Amortization of intangible liabilities, 2015	115
Amortization of intangible assets, 2016	33
Amortization of intangible liabilities, 2016	101
Amortization of intangible assets, 2017	33
Amortization of intangible liabilities, 2017	96
Amortization of intangible assets, 2018	31
Amortization of intangible liabilities, 2018	$ 90