Acquisitions, Goodwill, and Acquired Intangible Assets - Acquired Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangibles, Gross	$ 5,298	$ 5,350
Accumulated Amortization	(1,249)	(1,240)
Acquired Intangibles, Net	$ 4,049	4,110
Weighted Average Life Remaining	14 years 3 months 18 days
Amortization expense for acquired intangibles	$ 565	$ 475	$ 366
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		1 year
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life		25 years
Marketing-related
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangibles, Gross	2,303	$ 2,542
Accumulated Amortization	(340)	(431)
Acquired Intangibles, Net	$ 1,963	2,111
Weighted Average Life Remaining	20 years 8 months 12 days
Contract-based
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangibles, Gross	$ 1,702	1,430
Accumulated Amortization	(302)	(224)
Acquired Intangibles, Net	$ 1,400	1,206
Weighted Average Life Remaining	10 years 6 months
Technology- and content-based
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangibles, Gross	$ 1,011	941
Accumulated Amortization	(477)	(377)
Acquired Intangibles, Net	$ 534	564
Weighted Average Life Remaining	3 years 7 months 6 days
Customer-related
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Intangibles, Gross	$ 282	437
Accumulated Amortization	(130)	(208)
Acquired Intangibles, Net	$ 152	$ 229
Weighted Average Life Remaining	4 years 3 months 18 days