Contingencies and Other Matters - Anthem Litigation (Details) $ in Millions |
Dec. 31, 2018
USD ($)
|
---|---|
Contingencies And Other Matters [Abstract] | |
Termination fee payable to Company | $ 1,850 |
Positive Outcome Of Litigation [Member] | Minimum [Member] | |
Gain Contingencies [Line Items] | |
Damages sought | $ 13,000 |