Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Tax charge related to U.S. state blended tax rate changes associated with the Internal Reorganizations			$ 146
Tax benefit related to an internal legal entity restructuring associated with the Internal Reorganizations			102
Tax benefit related to the impact of recent tax law enactment in foreign jurisdictions		$ 14
Tax benefit related to an elective change in accounting method for the impact of the Act's foreign tax provisions		$ 51
Tax benefit related to the enactment of the Swiss Tax Reform	$ 38		38
Other Tax Benefit			21
Tax benefit (charge) related to application of the Act's foreign tax provisions	$ 13		$ (83)