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Long-Term Debt (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Level 1 [Member] \| Corporate Bonds [Member]
Debt Instrument [Line Items]
Fair value of debt	$ 5.8
Level 2 [Member] \| Other Bonds [Member]
Debt Instrument [Line Items]
Fair value of debt	0.8
Carrying Value of Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt	6.0	6.1
Fair Value of Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term debt	$ 6.6	$ 6.8

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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