Organization and Basis of Presentation, Fair Value (Details) - USD ($) $ in Billions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2017 |
Dec. 31, 2016 |
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions | ||
| Percent Of Trade Receivables With Balances greater than 90 days Outstanding | 1.00% | |
| Debt, carrying value | $ 3.8 | $ 4.1 |
| Debt, fair value | $ 4.0 | $ 4.3 |
| Maximum | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions | ||
| Percent of trade payables greater than 90 days outstanding | 1.00% | |
| Minimum | ||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions | ||
| Fair Value Assumptions, Expected Term | 90 days |