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					(52)
Equity incentive plans activity					10
Net income	$ 517					517
Dividends on common stock						(249)
Dividends on preferred stock						(58)
Shares acquired								(829)
Shares reissued under equity incentive plans, net								139
Change in unrealized net capital gains and losses	1,004								1,004
Change in unrealized foreign currency translation adjustments	19								19
Change in unrecognized pension and other postretirement benefit cost	27								27
Balance, end of period at Jun. 30, 2016	$ 20,553		$ 1,746	$ 9	3,203	39,623	$ (13)	(24,310)	295
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					(38)
Equity incentive plans activity					4
Net income	$ 1,274					1,274
Dividends on common stock						(272)
Dividends on preferred stock						(58)
Shares acquired								(646)
Shares reissued under equity incentive plans, net								146
Change in unrealized net capital gains and losses	473								473
Change in unrealized foreign currency translation adjustments	8								8
Change in unrecognized pension and other postretirement benefit cost	37								37
Balance, end of period at Jun. 30, 2017	$ 21,501		$ 1,746	$ 9	$ 3,269	$ 41,622	$ (6)	$ (25,241)	$ 102
Preferred stock, par value (in dollars per share)	$ 1	$ 0