Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Intangible assets
Finite-Lived Intangible Assets, Accumulated Amortization	$ 1,670		$ 1,670		$ 1,502
Weighted Amortizable Life (in years)			14 years		14 years
Finite-Lived Intangible Assets, Gross	4,123		$ 4,123		$ 4,323
Net	2,453		2,453		2,821
Intangible assets	2,453		2,453		2,821
Amortization expense	82	$ 81	246	$ 255
Remaining Three Months of 2016	79		79
2017	316		316
2018	308		308
2019	306		306
2020	295		295
Thereafter	1,149		1,149
Customer Relationships
Intangible assets
Finite-Lived Intangible Assets, Accumulated Amortization	915		$ 915		$ 809
Weighted Amortizable Life (in years)			15 years		15 years
Finite-Lived Intangible Assets, Gross	2,424		$ 2,424		$ 2,489
Net	1,509		1,509		1,680
Intellectual Property
Intangible assets
Finite-Lived Intangible Assets, Accumulated Amortization	681		$ 681		$ 626
Weighted Amortizable Life (in years)			11 years		11 years
Finite-Lived Intangible Assets, Gross	1,515		$ 1,515		$ 1,660
Net	834		834		1,034
Other
Intangible assets
Finite-Lived Intangible Assets, Accumulated Amortization	74		$ 74		$ 67
Weighted Amortizable Life (in years)			14 years		12 years
Finite-Lived Intangible Assets, Gross	184		$ 184		$ 174
Net	110		$ 110		$ 107
Resource Industries
Intangible assets
Impairment of Intangible Assets, Finite-lived	132
Resource Industries | Customer Relationships
Intangible assets
Impairment of Finite-lived Intangible Assets, Gross	96
Impairment of Finite-lived Intangible Assets, Accumulated Amortization	27
Resource Industries | Intellectual Property
Intangible assets
Impairment of Finite-lived Intangible Assets, Gross	111
Impairment of Finite-lived Intangible Assets, Accumulated Amortization	$ 48