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Consolidated Statement of Changes in Equity - USD ($) $ in Millions | Total | Total | Common Shares | Common Stock and Capital Surplus | Retained Earnings | Accumulated Other Comprehensive Inc. (Loss) | Noncontrolling Interests | Redeemable noncontrolling interests
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, shares at Dec. 31, 2016 |  |  | 86,924,399 |  |  |  |  |
Beginning Balance at Dec. 31, 2016 | $ 4,919 | $ 4,916 |  | $ 1,198 | $ 3,343 | $ 375 | $ 3 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to parent | 475 | 475 |  |  | 475 |  |  |
Net income (loss), including portion attributable to nonredeemable noncontrolling interest | 477 |  |  |  |  |  | 2 |
Other comprehensive income (loss) | 296 | 296 |  |  |  | 296 | 0 |
Impact of the U.S. corporate tax rate change on AOCI | 0 | 0 |  |  | (145) | 145 | 0 |
Dividends | (421) | (421) |  |  | (421) |  |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  | 1,020,986 |  |  |  |  |
Exercise of stock options | 34 | 34 |  | 34 |  |  |  |
Restricted stock awards, shares |  |  | 232,250 |  |  |  |  |
Restricted stock awards | 0 | 0 |  | 0 |  |  |  |
Other benefit plans, shares |  |  | 99,588 |  |  |  |  |
Other benefit plans | 10 | 10 |  | 10 |  |  |  |
Dividend reinvestment plan, shares |  |  | 42,572 |  |  |  |  |
Dividend reinvestment plan | 4 | 4 |  | 4 |  |  |  |
Stock-based compensation: Expense | 24 | 24 |  | 24 |  |  |  |
Shares exchanged — benefit plans, shares |  |  | (37,718) |  |  |  |  |
Shares exchanged — benefit plans | (5) | (5) |  | (1) | (4) |  |  |
Forfeitures of restricted stock, shares |  |  | (6,617) |  |  |  |  |
Forfeitures of restricted stock | 0 | 0 |  | 0 |  |  |  |
Sale of redeemable noncontrolling interests | (3) | (3) |  |  |  | (3) |  | $ 3
Other | (4) |  |  |  | 0 |  | (4) |
Ending Balance, shares at Dec. 31, 2017 |  |  | 88,275,460 |  |  |  |  |
Ending Balance at Dec. 31, 2017 | 5,331 | 5,330 |  | 1,269 | 3,248 | 813 | 1 |
Beginning Balance, Redeemable Noncontrolling Interests at Dec. 31, 2016 | 0 |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Sale of redeemable noncontrolling interests | (3) | (3) |  |  |  | (3) |  | $ 3
Other | 0 |  |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2017 | 3 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to parent | 530 | 530 |  |  | 530 |  |  |
Net income (loss), including portion attributable to nonredeemable noncontrolling interest | 531 |  |  |  |  |  | 1 |
Other comprehensive income (loss) | (544) | (544) |  |  |  | (544) | 0 |
Dividends | (397) | (397) |  |  | (397) |  |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  | 778,270 |  |  |  |  |
Exercise of stock options | 29 | 29 |  | 29 |  |  |  |
Restricted stock awards, shares |  |  | 200,625 |  |  |  |  |
Restricted stock awards | 0 | 0 |  | 0 |  |  |  |
Other benefit plans, shares |  |  | 103,797 |  |  |  |  |
Other benefit plans | 12 | 12 |  | 12 |  |  |  |
Dividend reinvestment plan, shares |  |  | 29,998 |  |  |  |  |
Dividend reinvestment plan | 3 | 3 |  | 3 |  |  |  |
Stock-based compensation: Expense | 23 | 23 |  | 23 |  |  |  |
Shares acquired and retired, shares |  |  | (65,589) |  |  |  |  |
Shares acquired and retired | (6) | (6) |  | (1) | (5) |  |  |
Shares exchanged — benefit plans, shares |  |  | (26,520) |  |  |  |  |
Shares exchanged — benefit plans | (3) | (3) |  | (1) | (2) |  |  |
Forfeitures of restricted stock, shares |  |  | (4,317) |  |  |  |  |
Forfeitures of restricted stock | 0 | 0 |  | 0 |  |  |  |
Other | $ (11) | (11) |  |  | (11) | 0 | 0 |
Ending Balance, shares at Dec. 31, 2018 | 89,291,724 |  | 89,291,724 |  |  |  |  |
Ending Balance at Dec. 31, 2018 | $ 4,972 | 4,970 |  | 1,334 | 3,588 | 48 | 2 |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable noncontrolling interest | (14) |  |  |  |  |  |  |
Other | 11 |  |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2018 | 0 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income (loss) attributable to parent | 897 | 897 |  |  | 897 |  |  |
Net income (loss), including portion attributable to nonredeemable noncontrolling interest | 895 |  |  |  |  |  | (2) |
Other comprehensive income (loss) | 815 | 815 |  |  |  | 815 | 0 |
Dividends | $ (446) | (446) |  |  | (446) |  |  |
Shares issued: |  |  |  |  |  |  |  |
Exercise of stock options, shares | 747,167 |  | 747,167 |  |  |  |  |
Exercise of stock options | $ 31 | 31 |  | 31 |  |  |  |
Restricted stock awards, shares |  |  | 232,635 |  |  |  |  |
Restricted stock awards | 0 | 0 |  | 0 |  |  |  |
Other benefit plans, shares |  |  | 77,429 |  |  |  |  |
Other benefit plans | 8 | 8 |  | 8 |  |  |  |
Dividend reinvestment plan, shares |  |  | 19,334 |  |  |  |  |
Dividend reinvestment plan | 2 | 2 |  | 2 |  |  |  |
Stock-based compensation: Expense | 23 | 23 |  | 23 |  |  |  |
Shares exchanged — benefit plans, shares |  |  | (50,062) |  |  |  |  |
Shares exchanged — benefit plans | (5) | (5) |  | (1) | (4) |  |  |
Forfeitures of restricted stock, shares |  |  | (14,541) |  |  |  |  |
Forfeitures of restricted stock | 0 | 0 |  | 0 |  |  |  |
Other | $ (26) | (26) |  |  | (26) |  | 0 |
Ending Balance, shares at Dec. 31, 2019 | 90,303,686 |  | 90,303,686 |  |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 6,269 | $ 6,269 |  | $ 1,397 | $ 4,009 | 863 | $ 0 |
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable noncontrolling interest | (26) |  |  |  |  |  |  |
Other | 26 |  |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2019 | $ 0 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Cumulative effect of accounting change |  |  |  |  |  | $ 0 |  |

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