Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Intangible assets
Weighted Amortizable Life (in years)			14 years		14 years
Finite-Lived Intangible Assets, Gross	$ 4,116		$ 4,116		$ 4,219
Finite-Lived Intangible Assets, Accumulated Amortization	2,486		2,486		2,322
Net	1,630		1,630		$ 1,897
Amortization expense	81	$ 82	244	$ 248
Remaining three months of 2019	80		80
2020	307		307
2021	289		289
2022	271		271
2023	214		214
Thereafter	469		$ 469
Customer Relationships
Intangible assets
Weighted Amortizable Life (in years)			15 years		15 years
Finite-Lived Intangible Assets, Gross	2,426		$ 2,426		$ 2,463
Finite-Lived Intangible Assets, Accumulated Amortization	1,352		1,352		1,249
Net	1,074		$ 1,074		$ 1,214
Intellectual Property
Intangible assets
Weighted Amortizable Life (in years)			12 years		11 years
Finite-Lived Intangible Assets, Gross	1,500		$ 1,500		$ 1,557
Finite-Lived Intangible Assets, Accumulated Amortization	1,015		1,015		965
Net	485		$ 485		$ 592
Other
Intangible assets
Weighted Amortizable Life (in years)			13 years		13 years
Finite-Lived Intangible Assets, Gross	190		$ 190		$ 199
Finite-Lived Intangible Assets, Accumulated Amortization	119		119		108
Net	$ 71		$ 71		$ 91