Goodwill and Other Intangible Assets and Liablities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	$ 660	$ 2,031
Intangible assets, accumulated amortization	192	1,519
Intangible liabilities, gross carrying amount	1,403	2,056
Intangible liabilities, accumulated amortization	736	1,274
Amortization of Intangible Assets	58	310
Amortization of intangible Liabilities	115	$ 179
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of intangible assets, 2016	39
Amortization of intangible liabilities, 2016	101
Amortization of intangible assets, 2017	36
Amortization of intangible liabilities, 2017	96
Amortization of intangible assets, 2018	33
Amortization of intangible liabilities, 2018	90
Amortization of intangible assets, 2019	31
Amortization of intangible liabilities, 2019	27
Amortization of intangible assets, 2020	31
Amortization of intangible liabilities, 2020	$ 26