Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Intangible assets
Weighted Amortizable Life (in years)			14 years		14 years
Gross Carrying Amount	$ 4,334		$ 4,334		$ 4,452
Accumulated Amortization	(1,493)		(1,493)		(1,376)
Net	2,841		2,841		3,076
Total intangible assets, net	2,841		2,841		$ 3,076
Amortization expense	81	$ 91	255	$ 276
Remaining Three Months of 2015	88		88
2016	327		327
2017	325		325
2018	319		319
2019	317		317
Thereafter	1,465		$ 1,465
Customer Relationships
Intangible assets
Weighted Amortizable Life (in years)			15 years		15 years
Gross Carrying Amount	2,427		$ 2,427		$ 2,489
Accumulated Amortization	(773)		(773)		(669)
Net	1,654		$ 1,654		$ 1,820
Intellectual Property
Intangible assets
Weighted Amortizable Life (in years)			11 years		11 years
Gross Carrying Amount	1,720		$ 1,720		$ 1,724
Accumulated Amortization	(645)		(645)		(578)
Net	1,075		$ 1,075		$ 1,146
Other
Intangible assets
Weighted Amortizable Life (in years)			13 years		11 years
Gross Carrying Amount	187		$ 187		$ 239
Accumulated Amortization	(75)		(75)		(129)
Net	$ 112		$ 112		$ 110