Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Gain on disposition	$ 8	$ 49	$ 16	$ 49
Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Gain on disposition		27		22
IR webhosting business | Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Gain on disposition	3		11
Gain on disposition after tax	2		10
Facility at East Windsor, NJ | Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Gain on disposition	4		4
Gain on disposition after tax	3		3
SPIAS | Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Gain on disposition	1	22	1	22
Gain on disposition after tax	$ 1	12	$ 1	12
RigData | Disposal Group, Held-for-sale, Not Discontinued Operations
Business Acquisition [Line Items]
Gain on disposition		27		27
Gain on disposition after tax		$ 26		$ 26