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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock | Additional Paid-In Capital | Unearned Compensation | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  |  | $ 1,466 | $ 1,984 | $ (5) | $ (20,181) | $ 20,531 | $ (3,855) |  | $ 303
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | $ 2,558 |  |  |  |  | 2,400 |  |  | 158
Other comprehensive income (loss), net of tax |  | (189) |  |  |  |  |  | (170) |  | (19)
Dividends (in dollars per share) | [1] |  |  |  |  |  | (1,448) |  |  | (143)
Stock-based compensation expense |  |  |  | 109 |  |  |  |  |  |
Shares issued for stock options |  |  |  | 137 |  | 190 |  |  |  |
Shares issued for restricted stock awards |  |  |  | (31) |  | 31 |  |  |  |
Treasury stock acquired |  |  |  |  |  | (1,238) |  |  |  |
Other |  |  |  | 5 | 2 | 2 | 132 | (163) | [2] |
Ending balance at Dec. 31, 2018 |  |  | 1,466 | 2,204 | (3) | (21,196) | 21,615 | (4,188) |  | 299
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 2,527 |  |  |  |  | 2,367 |  |  | 160
Other comprehensive income (loss), net of tax |  | (87) |  |  |  |  |  | (85) |  | (2)
Dividends (in dollars per share) | [1] |  |  |  |  |  | (1,472) |  |  | (141)
Stock-based compensation expense |  |  |  | 100 |  |  |  |  |  |
Shares issued for stock options |  |  |  | 210 |  | 305 |  |  |  |
Shares issued for restricted stock awards |  |  |  | (29) |  | 29 |  |  |  |
Noncontrolling interests acquired |  |  |  |  |  |  |  |  |  | 125
Treasury stock acquired |  |  |  |  |  | (1,202) |  |  |  |
Other | [2] |  |  | 3 | 1 | 1 | (9) |  |  |
Ending balance at Dec. 31, 2019 |  | 558 | 1,466 | 2,488 | (2) | (22,063) | 22,501 | (4,273) |  | 441
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income |  | 2,860 |  |  |  |  | 2,695 |  |  | 165
Other comprehensive income (loss), net of tax |  | (66) |  |  |  |  |  | (72) |  | 6
Dividends (in dollars per share) | [1] |  |  |  |  |  | (1,502) |  |  | (152)
Stock-based compensation expense |  |  |  | 107 |  |  |  |  |  |
Shares issued for stock options |  |  |  | 400 |  | 462 |  |  |  |
Shares issued for restricted stock awards |  |  |  | (31) |  | 31 |  |  |  |
Noncontrolling interests acquired |  |  |  |  |  |  |  |  |  | (99)
Treasury stock acquired |  |  |  |  |  | (1,476) |  |  |  |
Other |  |  |  | 5 | 1 | 1 | 5 |  |  | (3)
Ending balance at Dec. 31, 2020 |  | $ 1,101 | $ 1,466 | $ 2,969 | $ (1) | $ (23,045) | $ 23,699 | $ (4,345) |  | $ 358
[1] | * Two dividends were declared in each of the first quarters of 2020, 2019 and 2018.
[2] | (1) As a result of the early adoption of ASU 2018-02, the Company reclassified the stranded tax effects in Accumulated other comprehensive income (loss) resulting from the Tax Cuts and Jobs Act to Retained earnings.

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration