Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Tax charge related to U.S. state blended tax rate changes associated with the Internal Reorganizations		$ 114		$ 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		$ 14
Tax charge related to application of the Act's foreign tax provisions		96		96
Tax benefit related to an elective change in accounting method for the impact of the Act's foreign tax provisions	$ 51		$ 51
Other Tax Benefit		$ 21		$ 21