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Fair Values of Financial Instruments - Carrying Values and Fair Values of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short Term Investments	$ 1,318us-gaap_OtherShortTermInvestments	$ 2,114us-gaap_OtherShortTermInvestments
Fixed maturities	38,780	37,091
Equity securities	1,964	1,810
Long Term Debt	3,300us-gaap_LongTermDebt	3,300us-gaap_LongTermDebt
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short Term Investments	1,318	2,114
Fixed maturities	38,780	37,091
Equity securities	1,964	1,810
Long Term Debt	3,300	3,300
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short Term Investments	1,318	2,114
Fixed maturities	38,780	37,091
Equity securities	1,964	1,810
Long Term Debt	$ 4,013	$ 3,806

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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- Definition

Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer.

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