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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 |  |  |  |  |  |  |

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