CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Total shareholders' equity	Common stock	Additional capital paid-in	Retained income	Deferred ESOP expense	Treasury stock	Accumulated other comprehensive income	Noncontrolling interest
Balance, beginning of year at Dec. 31, 2009				$ 3,172	$ 31,098	$ (47)	$ (15,828)	$ (2,220)	$ 29
Increase (decrease) in equity
Equity incentive plans activity				4
Net income	911				911
Dividends ($0.88, $0.84 and $0.80 per share)					(433)
Payments						3
Shares acquired							(166)
Shares reissued under equity incentive plans, net							84
Change in unrealized net capital gains and losses	1,911							1,911
Change in unrealized foreign currency translation adjustments	23							23
Change in unrecognized pension and other postretirement benefit cost	94							94
Change in noncontrolling interest ownership									(14)
Noncontrolling gain									3
Cumulative effect of change in accounting principle					(18)			20	10
Balance, end of year at Dec. 31, 2010	18,645	18,617	9	3,176	31,558	(44)	(15,910)	(172)	28
Increase (decrease) in equity
Equity incentive plans activity				13
Net income	787				787
Dividends ($0.88, $0.84 and $0.80 per share)					(436)
Payments						1
Shares acquired							(950)
Shares reissued under equity incentive plans, net							65
Change in unrealized net capital gains and losses	452							452
Change in unrealized foreign currency translation adjustments	(12)							(12)
Change in unrecognized pension and other postretirement benefit cost	(239)							(239)
Change in noncontrolling interest ownership									(4)
Noncontrolling gain									4
Balance, end of year at Dec. 31, 2011	18,326	18,298	9	3,189	31,909	(43)	(16,795)	29	28
Increase (decrease) in equity
Equity incentive plans activity				(27)
Net income	2,306				2,306
Dividends ($0.88, $0.84 and $0.80 per share)					(432)
Payments						2
Shares acquired							(910)
Shares reissued under equity incentive plans, net							197
Change in unrealized net capital gains and losses	1,434							1,434
Change in unrealized foreign currency translation adjustments	14							14
Change in unrecognized pension and other postretirement benefit cost	(302)							(302)
Change in noncontrolling interest ownership									(28)
Balance, end of year at Dec. 31, 2012	$ 20,580	$ 20,580	$ 9	$ 3,162	$ 33,783	$ (41)	$ (17,508)	$ 1,175