Condensed Consolidated Statements of Shareholders’ Equity (unaudited) - 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 (loss)
Balance, beginning of period at Dec. 31, 2017			$ 1,746		$ 3,313	$ 41,579		$ (25,982)	$ 1,889
Increase (decrease) in equity
Preferred stock issuance, net of issuance costs			557
Forward contract on accelerated share repurchase agreement					45
Activity under equity incentive plans					83
Net income	$ 2,702					2,702
Dividends on common stock (declared per share of $0.50, $0.46, $1.50 and $1.38)						(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	(22)								(22)
Change in unamortized pension and other postretirement prior service credit	(45)								(45)
Balance, end of period at Sep. 30, 2018	$ 23,659	$ 0	2,303	$ 9	3,441	44,776	$ (3)	(27,011)	144
Increase (decrease) in equity
Dividends (in USD per share)	$ 1.38
Balance, beginning of period at Jun. 30, 2018			2,303		3,391	43,997		(26,818)	243
Increase (decrease) in equity
Preferred stock issuance, net of issuance costs			0
Forward contract on accelerated share repurchase agreement					0
Activity under equity incentive plans					50
Net income	$ 979					979
Dividends on common stock (declared per share of $0.50, $0.46, $1.50 and $1.38)						(163)
Dividends on preferred stock						(37)
Shares acquired								(225)
Shares reissued under equity incentive plans, net								32
Change in unrealized net capital gains and losses	(70)								(70)
Change in unrealized foreign currency translation adjustments	(14)								(14)
Change in unamortized pension and other postretirement prior service credit	(15)								(15)
Balance, end of period at Sep. 30, 2018	$ 23,659	0	2,303	9	3,441	44,776	(3)	(27,011)	144
Increase (decrease) in equity
Dividends (in USD per share)	$ 0.46
Balance, beginning of period at Dec. 31, 2018	$ 21,312		1,930		3,310	44,033		(28,085)	118
Increase (decrease) in equity
Preferred stock issuance, net of issuance costs			1,122
Forward contract on accelerated share repurchase agreement					150
Activity under equity incentive plans					51
Net income	3,074					3,074
Dividends on common stock (declared per share of $0.50, $0.46, $1.50 and $1.38)						(498)
Dividends on preferred stock						(103)
Shares acquired								(1,107)
Shares reissued under equity incentive plans, net								129
Change in unrealized net capital gains and losses	2,025								2,025
Change in unrealized foreign currency translation adjustments	(1)								(1)
Change in unamortized pension and other postretirement prior service credit	(35)								(35)
Balance, end of period at Sep. 30, 2019	$ 26,140	0	3,052	9	3,511	46,527	(3)	(29,063)	2,107
Increase (decrease) in equity
Dividends (in USD per share)	$ 1.5
Balance, beginning of period at Jun. 30, 2019			1,930		3,477	45,803		(28,500)	1,760
Increase (decrease) in equity
Preferred stock issuance, net of issuance costs			1,122
Forward contract on accelerated share repurchase agreement					0
Activity under equity incentive plans					34
Net income	$ 931					931
Dividends on common stock (declared per share of $0.50, $0.46, $1.50 and $1.38)						(165)
Dividends on preferred stock						(42)
Shares acquired								(609)
Shares reissued under equity incentive plans, net								46
Change in unrealized net capital gains and losses	369								369
Change in unrealized foreign currency translation adjustments	(10)								(10)
Change in unamortized pension and other postretirement prior service credit	(12)								(12)
Balance, end of period at Sep. 30, 2019	$ 26,140	$ 0	$ 3,052	$ 9	$ 3,511	$ 46,527	$ (3)	$ (29,063)	$ 2,107
Increase (decrease) in equity
Dividends (in USD per share)	$ 0.5