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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | $ 5,196 | $ 6,843 | $ 8,025 | $ 9,524 | $ 9,625 | $ 9,544 | $ 8,025 | $ 9,544
Net income (loss) | (19) | (1,681) | (1,015) | 296 | 77 | 152 | (2,715) | 525
Other comprehensive income (loss) | 2 | 9 | 11 | 0 | 1 | 1 | 22 | 2
Cash dividends | (40) | (40) | (158) | (158) | (157) | (157) |  |
Stock repurchase program |  |  | (100) |  | (100) |  | (100) |
Stock plans | 120 | 66 | 82 | 90 | 83 | 87 |  |
Other | 56 | 1 | 2 | (10) | 5 | 2 |  |
Ending Balance | $ 5,203 | $ 5,196 | $ 6,843 | $ 9,762 | $ 9,524 | $ 9,625 | 5,203 | 9,762
Common Stock, Dividends, Per Share, Declared | $ 0.045 | $ 0.045 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |
Common Shares |  |  |  |  |  |  |  |
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | $ 2,666 | $ 2,669 | $ 2,669 | $ 2,670 | $ 2,671 | $ 2,671 | 2,669 | 2,671
Net income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchase program |  |  | 0 |  | 0 |  |  |
Stock plans | 0 | 3 | 0 | 0 | 1 | 0 |  |
Other | 0 | 0 | 0 | 0 | 0 | 0 |  |
Ending Balance | 2,666 | 2,666 | 2,669 | 2,670 | 2,670 | 2,671 | 2,666 | 2,670
Paid-in Capital in Excess of Par Value |  |  |  |  |  |  |  |
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | 125 | 110 | 143 | 58 | 224 | 211 | 143 | 211
Net income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchase program |  |  | 0 |  | 0 |  |  |
Stock plans | 102 | 15 | 33 | 50 | 166 | 13 |  |
Other | 0 | 0 | 0 | 0 | 0 | 0 |  |
Ending Balance | 23 | 125 | 110 | 108 | 58 | 224 | 23 | 108
Treasury Stock |  |  |  |  |  |  |  |
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (6,358) | (6,412) | (6,427) | (6,520) | (6,670) | (6,744) | (6,427) | (6,744)
Net income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchase program |  |  | 100 |  | 100 |  |  |
Stock plans | 222 | 54 | 115 | 40 | 250 | 74 |  |
Other | 0 | 0 | 0 | 0 | 0 | 0 |  |
Ending Balance | (6,136) | (6,358) | (6,412) | (6,480) | (6,520) | (6,670) | (6,136) | (6,480)
Retained Earnings |  |  |  |  |  |  |  |
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | 9,098 | 10,814 | 11,989 | 13,652 | 13,734 | 13,739 | 11,989 | 13,739
Net income (loss) | (17) | (1,676) | (1,017) | 295 | 75 | 152 |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends | (40) | (40) | (158) | (158) | (157) | (157) |  |
Stock repurchase program |  |  | 0 |  | 0 |  |  |
Stock plans | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other | 54 | 0 | 0 | (11) | 0 | 0 |  |
Ending Balance | 8,987 | 9,098 | 10,814 | 13,800 | 13,652 | 13,734 | 8,987 | 13,800
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | (342) | (351) | (362) | (352) | (354) | (355) | (362) | (355)
Net income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss) | 2 | 9 | 11 | 0 | 1 | 1 |  |
Cash dividends | 0 | 0 | 0 | 0 | 0 | 0 |  |
Stock repurchase program |  |  | 0 |  | 0 |  |  |
Stock plans | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other | 0 | 0 | 0 | 1 | (1) | 0 |  |
Ending Balance | (340) | (342) | (351) | (353) | (352) | (354) | (340) | (353)
Noncontrolling Interest in Consolidated Subsidiaries |  |  |  |  |  |  |  |
Shareholders' equity activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning Balance | 7 | 13 | 13 | 16 | 20 | 22 | 13 | 22
Net income (loss) | (2) | (5) | 2 | 1 | 2 | 0 |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 0 | 0 | 0 |  |
Cash dividends |  |  |  | 0 |  |  |  |
Cash dividends | 0 | 0 | 0 |  | 0 | 0 |  |
Stock repurchase program |  |  | 0 |  | 0 |  |  |
Stock plans | 0 | 0 | 0 | 0 | 0 | 0 |  |
Other | 2 | 1 | 2 | 0 | 6 | 2 |  |
Ending Balance | $ 3 | $ 7 | $ 13 | $ 17 | $ 16 | $ 20 | $ 3 | $ 17

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