Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Net tax benefits associated with changes in accruals	$ 32	$ 58
Tax Benefit associated with U.S. Research and Development Tax Credits	$ 22	$ 22
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 impact of recent tax law enactment in foreign jurisdictions			$ 14