Consolidated Statements of Shareholders’ Equity - USD ($) $ in Millions	Total	Preferred Stock	Preferred stock additional capital paid-in	Common stock	Additional capital paid-in	Retained income	Deferred ESOP expense	Treasury stock	Accumulated other comprehensive income (loss)
Balance, beginning of year at Dec. 31, 2014					$ 3,199	$ 37,842	$ (23)	$ (21,030)	$ 561
Increase (decrease) in equity
Forward contract on accelerated share repurchase agreement					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
Reclassification of tax effects due to change in accounting principle						0			0
Balance, end of year at Dec. 31, 2015	20,025	$ 0	$ 1,746	$ 9	3,245	39,413	(13)	(23,620)	(755)
Increase (decrease) in equity
Forward contract on accelerated share repurchase agreement					0
Equity incentive plans activity					58
Net income	1,877					1,877
Dividends on common stock						(496)
Dividends on preferred stock						(116)
Payments							7
Shares acquired								(1,341)
Shares reissued under equity incentive plans, net								220
Change in unrealized net capital gains and losses	433								433
Change in unrealized foreign currency translation adjustments	10								10
Change in unrecognized pension and other postretirement benefit cost	(104)								(104)
Reclassification of tax effects due to change in accounting principle						0			0
Balance, end of year at Dec. 31, 2016	20,573	0	1,746	9	3,303	40,678	(6)	(24,741)	(416)
Increase (decrease) in equity
Forward contract on accelerated share repurchase agreement					(45)
Equity incentive plans activity					55
Net income	3,189					3,189
Dividends on common stock						(540)
Dividends on preferred stock						(116)
Payments							3
Shares acquired								(1,423)
Shares reissued under equity incentive plans, net								182
Change in unrealized net capital gains and losses	319								319
Change in unrealized foreign currency translation adjustments	47								47
Change in unrecognized pension and other postretirement benefit cost	307								307
Reclassification of tax effects due to change in accounting principle						(49)			49
Balance, end of year at Dec. 31, 2017	$ 22,551	$ 0	$ 1,746	$ 9	$ 3,313	$ 43,162	$ (3)	$ (25,982)	$ 306