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Consolidated Statement of Changes in Equity - USD ($) $ in Millions | Total | Cumulative effect, period of adoption, adjustment | Total | Common Shares | Common Stock and Capital Surplus | Retained Earnings | Retained Earnings Cumulative effect, period of adoption, adjustment | Accumulated Other Comprehensive Inc. (Loss) | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 4,972 |  | $ 4,970 |  | $ 1,334 | $ 3,588 |  | $ 48 | $ 2
Beginning Balance, shares at Dec. 31, 2018 |  |  |  | 89,291,724 |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | 4,972 |  | 4,970 |  | 1,334 | 3,588 |  | 48 | 2
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
Other comprehensive income (loss), including portion attributable to noncontrolling interest | 815 |  |  |  |  |  |  |  |
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
Ending Balance, shares at Dec. 31, 2019 |  |  |  | 90,303,686 |  |  |  |  |
Ending Balance at Dec. 31, 2019 | 6,269 | $ 7 | 6,269 |  | 1,397 | 4,009 | $ 7 | 863 | 0
Beginning Balance, redeemable noncontrolling interests at Dec. 31, 2018 | 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 | $ 7 | 6,269 |  | 1,397 | 4,009 | $ 7 | 863 | 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) | 416 |  | 414 |  |  |  |  | 414 | 0
Other comprehensive income (loss), including portion attributable to noncontrolling interest | 414 |  |  |  |  |  |  |  |
Dividends | (336) |  | (336) |  |  | (336) |  |  |
Shares issued: |  |  |  |  |  |  |  |  |
Exercise of stock options, shares |  |  |  | 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
Net income (loss) attributable to parent | 1,995 |  | 1,995 |  |  | 1,995 |  |  |
Net income (loss), including portion attributable to nonredeemable noncontrolling interest | 1,995 |  |  |  |  |  |  |  | 0
Other comprehensive income (loss) | (1,154) |  | (1,154) |  |  |  |  | (1,154) | 0
Other comprehensive income (loss), including portion attributable to noncontrolling interest | (1,154) |  |  |  |  |  |  |  |
Dividends | $ (2,382) |  | (2,382) |  |  | (2,382) |  |  |
Shares issued: |  |  |  |  |  |  |  |  |
Exercise of stock options, shares | 1,208,964 |  |  | 1,208,964 |  |  |  |  |
Exercise of stock options | $ 59 |  | 59 |  | 59 |  |  |  |
Restricted stock awards, shares |  |  |  | 207,020 |  |  |  |  |
Restricted stock awards | 0 |  | 0 |  | 0 |  |  |  |
Other benefit plans, shares |  |  |  | 81,286 |  |  |  |  |
Other benefit plans | 10 |  | 10 |  | 10 |  |  |  |
Dividend reinvestment plan, shares |  |  |  | 69,095 |  |  |  |  |
Dividend reinvestment plan | 8 |  | 8 |  | 8 |  |  |  |
Stock-based compensation expense | 16 |  | 16 |  | 16 |  |  |  |
Shares acquired and retired, shares |  |  |  | (2,777,684) |  |  |  |  |
Shares acquired and retired | (319) |  | (319) |  | (44) | (275) |  |  |
Shares exchanged — benefit plans, shares |  |  |  | (92,209) |  |  |  |  |
Shares exchanged — benefit plans | (10) |  | (10) |  | (1) | (9) |  |  |
Forfeitures of restricted stock, shares |  |  |  | (120,753) |  |  |  |  |
Forfeitures of restricted stock | $ 0 |  | 0 |  | 0 |  |  |  |
Ending Balance, shares at Dec. 31, 2021 | 84,920,965 |  |  | 84,920,965 |  |  |  |  |
Ending Balance at Dec. 31, 2021 | $ 5,012 |  | 5,012 |  | 1,415 | 3,478 |  | 119 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of accounting change | $ 5,012 |  | $ 5,012 |  | $ 1,415 | $ 3,478 |  | $ 119 | $ 0

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- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. + References No definition available. + Details
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- Definition Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Amount of increase (decrease) in temporary equity from changes classified as other. + References No definition available. + Details
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