Supplemental Financial Information - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Operating lease right-of-use assets	$ 577		$ 608
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	15	$ 42
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, additions	$ 49	$ 39