|
Supplemental Balance Sheet Information (Details) (USD $)
|
Mar. 31, 2015
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|---|
| Other current assets | |||
| Total other current assets | $ 1,597,000,000 | $ 1,298,000,000 | |
| Investments | |||
| Total investments | 102,000,000 | 102,000,000 | |
| Other assets | |||
| Total other assets | 1,338,000,000 | 1,554,000,000 | |
| Other current liabilities | |||
| Dividends payable | 600,000,000 | 600,000,000 | |
| Total other current liabilities | 2,239,000,000 | 2,918,000,000 | |
| Other liabilities | |||
| Total other liabilities | $ 1,386,000,000 | $ 1,555,000,000 |