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Fair Value Measurements - Narrative (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Estimated fair value and carrying amount of long-term debt	$ 3.3us-gaap_LongTermDebtFairValue	$ 3.3us-gaap_LongTermDebtFairValue
Carrying value long-term debt	$ 3.0us-gaap_LongTermDebt	$ 3.0us-gaap_LongTermDebt

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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