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	Previously reported	Previously reported Retained income	Previously reported Accumulated other comprehensive income	Adjustment	Adjustment Retained income	Adjustment Accumulated other comprehensive income
Balance, beginning of period at Dec. 31, 2017			$ 1,746		$ 3,313	$ 41,579		$ (25,982)	$ 1,889		$ 43,162	$ 306
Balance, beginning of period (Impact of change) at Dec. 31, 2017														$ (1,583)	$ 1,583
Increase (decrease) in equity
Preferred stock issuance			557
Forward contract on accelerated share repurchase agreement					45
Activity under equity incentive plans					9
Net income	$ 1,006					1,006				$ 975	975
Net income | Impact of change													$ 31	31
Dividends on common stock (declared per share of $0.50 and $0.46)						(165)					(165)
Dividends on common stock (declared per share of $0.50 and $0.46) | Impact of change														0
Dividends on preferred stock						(29)					(29)
Dividends on preferred stock | Impact of change														0
Shares acquired								(333)
Shares reissued under equity incentive plans, net								35
Change in unrealized net capital gains and losses	(565)								(565)	(565)		(565)
Change in unrealized net capital gains and losses | Impact of change													0		0
Change in unrealized foreign currency translation adjustments	(2)								(2)	(4)		(4)
Change in unrealized foreign currency translation adjustments | Impact of change													2		2
Change in unamortized pension and other postretirement prior service credit	(14)								(14)	23		23
Change in unamortized pension and other postretirement prior service credit | Impact of change													(37)		(37)
Balance, end of period at Mar. 31, 2018	$ 23,273	$ 0	2,303	$ 9	3,367	43,479	$ (3)	(26,280)	398	23,277	45,031	(1,150)
Balance, end of period (Impact of change) at Mar. 31, 2018													(4)	(1,552)	1,548
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		45,708	(1,557)
Balance, beginning of period (Impact of change) at Dec. 31, 2018														(1,675)	1,675
Increase (decrease) in equity
Preferred stock issuance			0
Forward contract on accelerated share repurchase agreement					0
Activity under equity incentive plans					(19)
Net income	1,292					1,292				1,287	1,287
Net income | Impact of change													5	5
Dividends on common stock (declared per share of $0.50 and $0.46)						(167)					(167)
Dividends on common stock (declared per share of $0.50 and $0.46) | Impact of change														0
Dividends on preferred stock						(31)					(31)
Dividends on preferred stock | Impact of change														0
Shares acquired								0
Shares reissued under equity incentive plans, net								43
Change in unrealized net capital gains and losses	974								974	974		974
Change in unrealized net capital gains and losses | Impact of change													0		0
Change in unrealized foreign currency translation adjustments	5								5	7		7
Change in unrealized foreign currency translation adjustments | Impact of change													(2)		(2)
Change in unamortized pension and other postretirement prior service credit	(12)								(12)	10		10
Change in unamortized pension and other postretirement prior service credit | Impact of change													22		22
Balance, end of period at Mar. 31, 2019	$ 23,418	$ 0	$ 1,930	$ 9	$ 3,291	$ 45,148	$ (3)	$ (28,042)	$ 1,085	$ 23,437	$ 46,818	$ (566)
Balance, end of period (Impact of change) at Mar. 31, 2019													$ (19)	$ (1,670)	$ 1,651
Increase (decrease) in equity
Dividends (in USD per share)	$ 0.50