Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended
	Feb. 28, 2019	Mar. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Accrued Liabilities and Other Liabilities		$ 1,915	$ 2,267
Insurance receivable for malpractice		6
FCPA Accrual [Member]
Other Commitments [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 28
India Defined Contribution Obligation [Member]
Other Commitments [Line Items]
Accrued Liabilities and Other Liabilities		$ 117