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