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Fair Value Measurements - Summary of Investments (Details)
$ in Millions
Dec. 31, 2014
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Amortized Cost $ 24
Gross Unrealized Gains 0
Gross Unrealized Losses 0
Estimated Fair Value 24
U.S. government and agency securities  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Amortized Cost 11
Gross Unrealized Gains 0
Gross Unrealized Losses 0
Estimated Fair Value 11
Obligations of government-sponsored enterprises  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Amortized Cost 1
Gross Unrealized Gains 0
Gross Unrealized Losses 0
Estimated Fair Value 1
State and municipal bonds  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Amortized Cost 5
Gross Unrealized Gains 0
Gross Unrealized Losses 0
Estimated Fair Value 5
Corporate Securities  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Amortized Cost 7
Gross Unrealized Gains 0
Gross Unrealized Losses 0
Estimated Fair Value $ 7