Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other Commitments [Line Items]
Accrued Liabilities and Other Liabilities	$ 2,290	$ 2,191
Insurance receivable for malpractice	15
India Defined Contribution Obligation [Member]
Other Commitments [Line Items]
Accrued Liabilities and Other Liabilities	$ 117