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Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions | Total | Cumulative effect of adopting Accounting Standards Update No. 2016-01, Financial Instruments (See Note 1) | Common Stock | Capital in excess of par value | Retained earnings | Retained earnings Cumulative effect of adopting Accounting Standards Update No. 2016-01, Financial Instruments (See Note 1) | Accumulated other comprehensive income (loss) | Accumulated other comprehensive income (loss) Cumulative effect of adopting Accounting Standards Update No. 2016-01, Financial Instruments (See Note 1) | Treasury stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 | $ 9,832 |  | $ 808 | $ 1,581 | $ 17,945 |  | $ (61) |  | $ (10,441)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Repurchase of common stock | (451) |  |  |  |  |  |  |  | (451)
Issuance of common and treasury stock pursuant to Employee stock plans | (2) |  |  | (8) |  |  |  |  | 6
Share-based compensation | 9 |  |  | 9 |  |  |  |  |
Cash dividends | (94) |  |  |  | (94) |  |  |  |
Comprehensive income (loss) | (219) |  |  |  | (94) |  | (125) |  |
Balance at end of period at Mar. 31, 2020 | 9,075 |  | 808 | 1,582 | 17,757 |  | (186) |  | (10,886)
Balance at beginning of period at Dec. 31, 2019 | 9,832 |  | 808 | 1,581 | 17,945 |  | (61) |  | (10,441)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (1,078) |  |  |  |  |  |  |  |
Balance at end of period at Jun. 30, 2020 | 10,878 |  | 888 | 4,159 | 16,842 |  | (130) |  | (10,881)
Balance at beginning of period at Mar. 31, 2020 | 9,075 |  | 808 | 1,582 | 17,757 |  | (186) |  | (10,886)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs | 2,224 |  | 80 | 2,144 |  |  |  |  |
Issuance of common and treasury stock pursuant to Employee stock plans | 13 |  |  | 8 |  |  |  |  | 5
Share-based compensation | (2) |  |  | (2) |  |  |  |  |
Stock warrants | 35 |  |  | 35 |  |  |  |  |
Equity feature of convertible notes, net of issuance costs | 392 |  |  | 392 |  |  |  |  |
Comprehensive income (loss) | (859) |  |  |  | (915) |  | 56 |  |
Balance at end of period at Jun. 30, 2020 | 10,878 |  | 888 | 4,159 | 16,842 |  | (130) |  | (10,881)
Balance at beginning of period at Dec. 31, 2020 | 8,876 | $ 0 | 888 | 4,191 | 14,777 | $ 19 | (105) | $ (19) | (10,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common and treasury stock pursuant to Employee stock plans | 0 |  |  | (8) |  |  |  |  | 8
Share-based compensation | 14 |  |  | 14 |  |  |  |  |
Stock warrants | 23 |  |  | 23 |  |  |  |  |
Comprehensive income (loss) | 180 |  |  |  | 116 |  | 64 |  |
Balance at end of period at Mar. 31, 2021 | 9,093 |  | 888 | 4,220 | 14,912 |  | (60) |  | (10,867)
Balance at beginning of period at Dec. 31, 2020 | 8,876 | $ 0 | 888 | 4,191 | 14,777 | $ 19 | (105) | $ (19) | (10,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | 723 |  |  |  |  |  |  |  |
Balance at end of period at Jun. 30, 2021 | 9,688 |  | 888 | 4,269 | 15,260 |  | 136 |  | (10,865)
Balance at beginning of period at Mar. 31, 2021 | 9,093 |  | 888 | 4,220 | 14,912 |  | (60) |  | (10,867)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common and treasury stock pursuant to Employee stock plans | 13 |  |  | 11 |  |  |  |  | 2
Share-based compensation | 16 |  |  | 16 |  |  |  |  |
Stock warrants | 22 |  |  | 22 |  |  |  |  |
Comprehensive income (loss) | 544 |  |  |  | 348 |  | 196 |  |
Balance at end of period at Jun. 30, 2021 | $ 9,688 |  | $ 888 | $ 4,269 | $ 15,260 |  | $ 136 |  | $ (10,865)

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