Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Intangible assets
Weighted Amortizable Life (in years)			14 years		14 years
Finite-Lived Intangible Assets, Gross	$ 4,175		$ 4,175		$ 4,219
Finite-Lived Intangible Assets, Accumulated Amortization	2,442		2,442		2,322
Net	1,733		1,733		$ 1,897
Amortization expense	81	$ 83	163	$ 166
Remaining six months of 2019	162		162
2020	311		311
2021	293		293
2022	274		274
2023	216		216
Thereafter	477		$ 477
Customer Relationships
Intangible assets
Weighted Amortizable Life (in years)			15 years		15 years
Finite-Lived Intangible Assets, Gross	2,460		$ 2,460		$ 2,463
Finite-Lived Intangible Assets, Accumulated Amortization	1,330		1,330		1,249
Net	1,130		$ 1,130		$ 1,214
Intellectual Property
Intangible assets
Weighted Amortizable Life (in years)			12 years		11 years
Finite-Lived Intangible Assets, Gross	1,516		$ 1,516		$ 1,557
Finite-Lived Intangible Assets, Accumulated Amortization	992		992		965
Net	524		$ 524		$ 592
Other
Intangible assets
Weighted Amortizable Life (in years)			12 years		13 years
Finite-Lived Intangible Assets, Gross	199		$ 199		$ 199
Finite-Lived Intangible Assets, Accumulated Amortization	120		120		108
Net	$ 79		$ 79		$ 91