Reportable Segment Information (Additional Information) (Details) $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
|
Sep. 30, 2015
USD ($)
|
Sep. 30, 2016
Segment
|
Sep. 30, 2015
USD ($)
|
|
| Segment Reporting Information [Line Items] | |||
| Noncash Pension Settlement Charges, other - before tax | $ | $ 7 | $ 7 | |
| Number of Operating Segments | Segment | 11 | ||
| Number of Reportable Segments | 3 | ||