Condensed Consolidated Statements of Shareholders’ Equity - USD ($) $ in Millions	Total	Preferred Stock	Preferred stock additional capital paid-in	Common stock par value	Common stock additional capital paid-in	Retained income	Deferred ESOP expense	Treasury stock	Accumulated other comprehensive income
Increase (decrease) in equity
Cumulative effect of change in accounting principle						$ 0			$ 0
Balance, beginning of period at Dec. 31, 2016			$ 1,746		$ 3,303	40,678		$ (24,741)	(416)
Increase (decrease) in equity
Preferred stock issuance			0
Forward contract on accelerated share repurchase agreement					0
Equity incentive plans activity					27
Net income	$ 1,940					1,940
Dividends on common stock						(406)
Dividends on preferred stock						(87)
Shares acquired								(845)
Shares reissued under equity incentive plans, net								173
Change in unrealized net capital gains and losses	598								598
Change in unrealized foreign currency translation adjustments	36								36
Change in unrecognized pension and other postretirement benefit cost	110								110
Balance, end of period at Sep. 30, 2017	22,119	$ 0	1,746	$ 9	3,330	42,125	$ (6)	(25,413)	328
Increase (decrease) in equity
Cumulative effect of change in accounting principle						1,088			(910)
Balance, beginning of period at Dec. 31, 2017	22,551		1,746		3,313	43,162		(25,982)	306
Increase (decrease) in equity
Preferred stock issuance			557
Forward contract on accelerated share repurchase agreement					45
Equity incentive plans activity					83
Net income	2,521					2,521
Dividends on common stock						(488)
Dividends on preferred stock						(105)
Shares acquired								(1,117)
Shares reissued under equity incentive plans, net								88
Change in unrealized net capital gains and losses	(768)								(768)
Change in unrealized foreign currency translation adjustments	(25)								(25)
Change in unrecognized pension and other postretirement benefit cost	113								113
Balance, end of period at Sep. 30, 2018	$ 23,633	$ 0	$ 2,303	$ 9	$ 3,441	$ 46,178	$ (3)	$ (27,011)	$ (1,284)