Fair Values of Financial Instruments (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Carrying values and fair values of financial instruments [Abstract]
Equity securities, Fair value	$ 1,663	$ 1,550
Short term investments	1,690	1,905
Total fixed maturities, Fair value	37,367	36,519
Long term debt	3,975	3,975
Carrying Value [Member]
Carrying values and fair values of financial instruments [Abstract]
Equity securities, Fair value	1,663	1,550
Short term investments	1,690	1,905
Total fixed maturities, Fair value	37,367	36,519
Long term debt	3,975	3,975
Fair Value [Member]
Carrying values and fair values of financial instruments [Abstract]
Equity securities, Fair value	1,663	1,550
Short term investments	1,690	1,905
Total fixed maturities, Fair value	37,367	36,519
Long term debt	$ 4,262	$ 4,318

- Definition

For an unclassified balance sheet, this item represents equity securities categorized neither as held-to-maturity nor trading. Equity securities represent ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is not mandatorily redeemable or redeemable at the option of the holder), convertible securities, stock rights, or stock warrants. Unrealized gains and losses related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis.

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