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Fidelis Care Acquisition (Details) - USD ($) shares in Millions, $ in Millions		1 Months Ended	12 Months Ended
	Jul. 01, 2018	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Department Of Health, State Of New York
Business Acquisition [Line Items]
Commitment to undertaking	$ 340		$ 328
Commitment to undertaking, term	5 years
Public Stock Offering
Business Acquisition [Line Items]
Shares issued to fund acquisition (in shares)		53
Fidelis Care
Business Acquisition [Line Items]
Acquisition consideration	$ 3,604
Revenue of acquiree since acquisition date, actual			5,628
Total revenues			$ 65,792	$ 58,275

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