Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Intangible assets
Weighted Amortizable Life (in years)	14 years		14 years
Finite-Lived Intangible Assets, Gross	$ 4,076		$ 4,151
Finite-Lived Intangible Assets, Accumulated Amortization	2,598		2,586
Net	1,478		$ 1,565
Amortization expense	80	$ 82
Remaining nine months of 2020	226
2021	288
2022	271
2023	214
2024	157
Thereafter	$ 322
Customer Relationships
Intangible assets
Weighted Amortizable Life (in years)	15 years		15 years
Finite-Lived Intangible Assets, Gross	$ 2,402		$ 2,450
Finite-Lived Intangible Assets, Accumulated Amortization	1,421		1,406
Net	$ 981		$ 1,044
Intellectual Property
Intangible assets
Weighted Amortizable Life (in years)	12 years		12 years
Finite-Lived Intangible Assets, Gross	$ 1,488		$ 1,510
Finite-Lived Intangible Assets, Accumulated Amortization	1,050		1,055
Net	$ 438		$ 455
Other
Intangible assets
Weighted Amortizable Life (in years)	13 years		13 years
Finite-Lived Intangible Assets, Gross	$ 186		$ 191
Finite-Lived Intangible Assets, Accumulated Amortization	127		125
Net	$ 59		$ 66