CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Total shareholders' equity	Preferred Stock	Preferred stock additional capital paid-in	Common stock	Additional capital paid-in	Retained income	Deferred ESOP expense	Treasury stock	Accumulated other comprehensive (loss) income
Preferred stock, par value (in dollars per share)			$ 0
Balance, beginning of year at Dec. 31, 2012				$ 0		$ 3,162	$ 33,783	$ (41)	$ (17,508)	$ 1,175
Increase (decrease) in equity
Preferred stock issuance				780
Equity incentive plans activity						(19)
Net income	$ 2,280						2,280
Dividends on common stock							(466)
Dividends on preferred stock							(17)
Payments								10
Shares acquired									(1,845)
Shares reissued under equity incentive plans, net									306
Change in unrealized net capital gains and losses	(1,188)									(1,188)
Change in unrealized foreign currency translation adjustments	(32)									(32)
Change in unrecognized pension and other postretirement benefit cost	1,091									1,091
Balance, end of year at Dec. 31, 2013		$ 21,480		780	$ 9	3,143	35,580	(31)	(19,047)	1,046
Preferred stock, par value (in dollars per share)			0
Increase (decrease) in equity
Preferred stock issuance				966
Equity incentive plans activity						56
Net income	2,850						2,850
Dividends on common stock							(484)
Dividends on preferred stock							(104)
Payments								8
Shares acquired									(2,306)
Shares reissued under equity incentive plans, net									323
Change in unrealized net capital gains and losses	280									280
Change in unrealized foreign currency translation adjustments	(40)									(40)
Change in unrecognized pension and other postretirement benefit cost	$ (725)									(725)
Balance, end of year at Dec. 31, 2014		22,304		1,746	9	3,199	37,842	(23)	(21,030)	561
Preferred stock, par value (in dollars per share)	$ 1		$ 0
Increase (decrease) in equity
Preferred stock issuance				0
Equity incentive plans activity						46
Net income	$ 2,171						2,171
Dividends on common stock							(484)
Dividends on preferred stock							(116)
Payments								10
Shares acquired									(2,804)
Shares reissued under equity incentive plans, net									214
Change in unrealized net capital gains and losses	(1,306)									(1,306)
Change in unrealized foreign currency translation adjustments	(58)									(58)
Change in unrecognized pension and other postretirement benefit cost	$ 48									48
Balance, end of year at Dec. 31, 2015		$ 20,025		$ 1,746	$ 9	$ 3,245	$ 39,413	$ (13)	$ (23,620)	$ (755)
Preferred stock, par value (in dollars per share)	$ 1