Income Taxes (Details 4) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 188	$ 113	$ 100
Income Tax Examination, Penalties and Interest Accrued	26	$ 12
Timing of Anticipated Impact [Domain]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 26