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Consolidated Statement of Changes in Equity - USD ($) $ in Millions | Total | Cumulative effect, period of adoption, adjustment | Total | Total Cumulative effect, period of adoption, adjustment | Common Shares | Common Stock and Capital Surplus | Retained Earnings | Retained Earnings Cumulative effect, period of adoption, adjustment | Accumulated Other Comprehensive Inc. (Loss) | Accumulated Other Comprehensive Inc. (Loss) Cumulative effect, period of adoption, adjustment | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 5,331 | $ 4 | $ 5,330 | $ 4 |  | $ 1,269 | $ 3,248 | $ 225 | $ 813 | $ (221) | $ 1
Beginning Balance, shares at Dec. 31, 2017 |  |  |  |  | 88,275,460 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2017 | 5,331 | 4 | 5,330 | 4 |  | 1,269 | 3,248 | 225 | 813 | (221) | 1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | 4,972 | $ 4 | 4,970 | $ 4 |  | 1,334 | 3,588 | 225 | 48 | (221) | 2
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), Net of Tax, including Portion Attributable to Noncontrolling Interest | (544) |  |  |  |  |  |  |  |  |  |
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
Ending Balance, shares at Dec. 31, 2018 |  |  |  |  | 89,291,724 |  |  |  |  |  |
Ending Balance at Dec. 31, 2018 | 4,972 |  | 4,970 |  |  | 1,334 | 3,588 |  | 48 |  | 2
Beginning Balance, Redeemable Noncontrolling Interests at Dec. 31, 2017 | 3 |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | 4,972 |  | 4,970 |  |  | 1,334 | 3,588 |  | 48 |  | 2
Cumulative effect of accounting change | 4,972 |  | 6,269 |  |  | 1,397 | 4,009 | 7 | 863 | 0 | 0
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), Net of Tax, including Portion Attributable to Noncontrolling Interest | 815 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 815 |  | 815 |  |  |  |  |  | 815 |  | 0
Dividends | (446) |  | (446) |  |  |  | (446) |  |  |  |
Shares issued: |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  |  | 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 |  | 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 | 7 | 863 | 0 | 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 | 6,269 |  | 6,269 |  |  | 1,397 | 4,009 | 7 | 863 | 0 | 0
Cumulative effect of accounting change | 6,269 |  | 6,789 |  |  | 1,367 | 4,149 | $ 7 | 1,273 | $ 0 | 0
Net income (loss) attributable to parent | 732 |  | 732 |  |  |  | 732 |  |  |  |
Net income (loss), including portion attributable to nonredeemable noncontrolling interest | 734 |  |  |  |  |  |  |  |  |  | 2
Other Comprehensive Income (Loss), Net of Tax, including Portion Attributable to Noncontrolling Interest | 414 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 416 |  | 414 |  |  |  |  |  | 414 |  | 0
Dividends | $ (336) |  | (336) |  |  |  | (336) |  |  |  |
Shares issued: |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options, shares | 328,471 |  |  |  | 328,471 |  |  |  |  |  |
Exercise of stock options | $ 14 |  | 14 |  |  | 14 |  |  |  |  |
Restricted stock awards, shares |  |  |  |  | 227,867 |  |  |  |  |  |
Restricted stock awards | 0 |  | 0 |  |  | 0 |  |  |  |  |
Other benefit plans, shares |  |  |  |  | 143,270 |  |  |  |  |  |
Other benefit plans | 10 |  | 10 |  |  | 10 |  |  |  |  |
Dividend reinvestment plan, shares |  |  |  |  | 18,690 |  |  |  |  |  |
Dividend reinvestment plan | 2 |  | 2 |  |  | 2 |  |  |  |  |
Stock-based compensation: Expense | 20 |  | 20 |  |  | 20 |  |  |  |  |
Shares acquired and retired, shares |  |  |  |  | (4,531,394) |  |  |  |  |  |
Shares acquired and retired | (313) |  | (313) |  |  | (70) | (243) |  |  |  |
Shares exchanged — benefit plans, shares |  |  |  |  | (101,663) |  |  |  |  |  |
Shares exchanged — benefit plans | (11) |  | (11) |  |  | (2) | (9) |  |  |  |
Forfeitures of restricted stock, shares |  |  |  |  | (43,681) |  |  |  |  |  |
Forfeitures of restricted stock | 0 |  | 0 |  |  | 0 |  |  |  |  |
Other | $ (21) |  | (19) |  |  | (4) | (11) |  | (4) |  | (2)
Ending Balance, shares at Dec. 31, 2020 | 86,345,246 |  |  |  | 86,345,246 |  |  |  |  |  |
Ending Balance at Dec. 31, 2020 | $ 6,789 |  | 6,789 |  |  | 1,367 | 4,149 |  | 1,273 |  | 0
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to redeemable noncontrolling interest | (13) |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax attributable to redeemable noncontrolling interests | 2 |  |  |  |  |  |  |  |  |  |
Other | 11 |  |  |  |  |  |  |  |  |  |
Ending Balance, Redeemable Noncontrolling Interests at Dec. 31, 2020 | 0 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 6,789 |  | $ 6,789 |  |  | $ 1,367 | $ 4,149 |  | $ 1,273 |  | $ 0

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