Goodwill and Other Intangible Assets and Liablities Intangible Assets and Liabilities Carrying Amount (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross carrying amount	$ 661	$ 660
Intangible assets, accumulated amortization	231	192
Intangible liabilities, gross carrying amount	1,403	1,403
Intangible liabilities, accumulated amortization	836	736
Amortization of Intangible Assets	39	58	$ 310
Amortization of intangible Liabilities	100	$ 115	$ 179
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
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
Amortization of intangible assets, 2021	31
Amortization of intangible liabilities, 2021	$ 24