Consolidated Statements of Shareholders’ Equity - USD ($) $ in Millions	Total	Preferred Stock	Balance, end of year	Common stock par value	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, 2016			$ 1,746		$ 3,303	$ 39,009	$ (6)	$ (24,741)	$ 1,249
Increase (decrease) in equity
Preferred stock issuance, net of issuance costs			0
Preferred stock redemption			0
Forward contract on accelerated share repurchase agreement					(45)
Equity incentive plans activity					55
Net income	$ 3,554					3,554
Dividends on common stock (declared per share of $2.00, $1.84 and $1.48)						(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	45								45
Change in unamortized pension and other postretirement prior service credit	(52)								(52)
Reclassification of tax effects due to change in accounting principle						(328)			328
Balance, end of year at Dec. 31, 2017	22,551	$ 0	1,746	$ 9	3,313	41,579	(3)	(25,982)	1,889
Increase (decrease) in equity
Cumulative effect of change in accounting principle									(910)
Preferred stock issuance, net of issuance costs			557
Preferred stock redemption			(373)
Forward contract on accelerated share repurchase agreement					(105)
Equity incentive plans activity					102
Net income	2,160					2,160
Dividends on common stock (declared per share of $2.00, $1.84 and $1.48)						(646)
Dividends on preferred stock						(148)
Payments	0
Shares acquired								(2,198)
Shares reissued under equity incentive plans, net								95
Change in unrealized net capital gains and losses	(754)								(754)
Change in unrealized foreign currency translation adjustments	(48)								(48)
Change in unamortized pension and other postretirement prior service credit	(59)								(59)
Reclassification of tax effects due to change in accounting principle						0			0
Balance, end of year at Dec. 31, 2018	21,312	0	1,930	9	3,310	44,033	(3)	(28,085)	118
Increase (decrease) in equity
Preferred stock issuance, net of issuance costs			1,414
Preferred stock redemption			(1,096)
Forward contract on accelerated share repurchase agreement					75
Equity incentive plans activity					78
Net income	4,847					4,847
Dividends on common stock (declared per share of $2.00, $1.84 and $1.48)						(658)
Dividends on preferred stock						(169)
Payments	3
Shares acquired								(1,810)
Shares reissued under equity incentive plans, net								149
Change in unrealized net capital gains and losses	1,889								1,889
Change in unrealized foreign currency translation adjustments	(10)								(10)
Change in unamortized pension and other postretirement prior service credit	(47)								(47)
Reclassification of tax effects due to change in accounting principle						0			0
Balance, end of year at Dec. 31, 2019	$ 25,998	$ 0	$ 2,248	$ 9	$ 3,463	$ 48,074	$ 0	$ (29,746)	$ 1,950