Contingencies (Health Care Cost Recovery Litigation) (Details) - Health Care Cost Recovery Actions [Member] |
1 Months Ended | 3 Months Ended | |||
|---|---|---|---|---|---|
|
Nov. 30, 1998
USD ($)
state
|
Mar. 31, 2018
USD ($)
case
|
Mar. 31, 2017
USD ($)
|
Apr. 27, 2017
case
|
Apr. 25, 2016
case
|
|
| Loss Contingencies [Line Items] | |||||
| Number of cases pending | case | 1 | 1 | |||
| Number of states with settled litigation | state | 46 | ||||
| State Settlement Agreements annual payments | $ 9,400,000,000 | ||||
| State Settlement Agreements attorney fees annual cap | $ 500,000,000 | ||||
| Litigation settlement | $ 1,000,000,000 | $ 1,100,000,000 | |||
| Threatened Litigation [Member] | Canada [Member] | |||||
| Loss Contingencies [Line Items] | |||||
| Number of cases pending | case | 10 | ||||