Schedule II (details) - Condensed Balance Sheet (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Balance Sheet
Fixed maturities, at fair value	$ 63,474	$ 63,956
Equity securities	899	943
Short-term securities	4,364	3,882
Total assets	103,078	103,812
Debt	6,349	6,346
Total liabilities	78,242	79,016
Common stock (1,750.0 shares authorized; 322.2 and 353.5 shares issued and outstanding)	21,843	21,500	21,161	20,732
Retained earnings	27,251	24,291	21,352	19,579
Accumulated other comprehensive income	880	810	2,236	2,005
Treasury stock, at cost (437.3 and 401.5 shares)	(25,138)	(21,805)	(19,344)	(17,839)
Total shareholders' equity	24,836	24,796	25,405
Total liabilities and shareholders' equity	103,078	103,812
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	322.2	353.5
Common stock, shares outstanding	322.2	353.5	377.4	392.8
Treasury stock, at cost, shares	437.3	401.5
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Condensed Balance Sheet
Fixed maturities, at fair value	30	37
Equity securities	141	130
Short-term securities	1,530	1,523
Investment in subsidiaries	28,821	28,616
Other assets	72	144
Total assets	30,594	30,450
Debt	5,657	5,654
Other liabilities	114	10
Total liabilities	5,771	5,664
Common stock (1,750.0 shares authorized; 322.2 and 353.5 shares issued and outstanding)	21,843	21,500
Retained earnings	27,238	24,281
Accumulated other comprehensive income	880	810
Treasury stock, at cost (437.3 and 401.5 shares)	(25,138)	(21,805)
Total shareholders' equity	24,823	24,786
Total liabilities and shareholders' equity	$ 30,594	$ 30,450
Common stock, shares authorized	1,750.0	1,750.0
Common stock, shares issued	322.2	353.5
Common stock, shares outstanding	322.2	353.5
Treasury stock, at cost, shares	437.3	401.5