Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Noncontrolling Interest - Narrative (Details)

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Acquisitions and Noncontrolling Interest - Narrative (Details) - U.S. Medical Management
$ in Millions
1 Months Ended
Aug. 31, 2017
USD ($)
Business Acquisition [Line Items]  
Percentage of ownership interests acquired 32.00%
Consideration transferred $ 86
Cash paid to acquire business 33
Deferred consideration 33
Settlement of receivable from former noncontrolling interest holder $ 20