Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020
Income Tax Contingency [Line Items]
(Provision) benefit for income taxes	$ (202)	$ (241)	$ (339)	$ 135
Effective income tax rate	21.60%	19.50%	21.30%	(4.80%)
Impact (benefit) from restructuring and other corporate matters, depreciation on abandoned technology and other discrete tax items		$ 5		$ (29)
Transfer of intangible assets				768
Benefit from bankruptcy of investee		$ 32		32
Provision for gain on sale of assets				$ 163
Percentage point decrease in effective tax rate		2.70%		27.00%
Decrease in uncertain tax positions	$ 125		$ 125
Forecast [Member]
Income Tax Contingency [Line Items]
Tax expense (benefit) from changes in UK tax rate					$ (100)