Condensed 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 (loss) income
Balance, beginning of period at Dec. 31, 2015					$ 3,245	$ 39,413		$ (23,620)	$ (755)
Increase (decrease) in equity
Forward contract on accelerated share repurchase agreement					(37)
Equity incentive plans activity					29
Net income	$ 1,037					1,037
Dividends on common stock						(373)
Dividends on preferred stock						(87)
Shares acquired								(1,094)
Shares reissued under equity incentive plans, net								177
Change in unrealized net capital gains and losses	1,197								1,197
Change in unrealized foreign currency translation adjustments	12								12
Change in unrecognized pension and other postretirement benefit cost	48								48
Balance, end of period at Sep. 30, 2016	$ 20,934		$ 1,746	$ 9	3,237	39,990	$ (13)	(24,537)	502
Preferred stock, par value (in dollars per share)		$ 0
Preferred stock, par value (in dollars per share)	$ 1
Balance, beginning of period at Dec. 31, 2016					3,303	40,678		(24,741)	(416)
Increase (decrease) in equity
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		$ 1,746	$ 9	$ 3,330	$ 42,125	$ (6)	$ (25,413)	$ 328
Preferred stock, par value (in dollars per share)	$ 1	$ 0