Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Other Financial Data [Abstract]
Deferred revenue	$ 309	$ 270
Leases	200	210
Taxes payable	196	93
Other	572	513
Total	1,277	1,086
Revenue recognized from deferred revenue	$ 117	$ 532