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Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | ---
Common Stock, Shares, Beginning period at Dec. 31, 2014 |  | 1,499 |  |  |  |
Beginning Balance at Dec. 31, 2014 | $ 15,819 | $ 2 | $ 2,391 | $ 301 | $ 12,732 | $ 393
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Change in noncontrolling interest | 188 |  |  |  |  | 188
Net income (loss) | 18,106 |  |  |  | 18,108 | (2)
Other comprehensive loss, net of tax | (213) |  |  | (213) |  |
Issuances under employee stock purchase plan, Shares |  | 1 |  |  |  |
Issuances under employee stock purchase plan, Value | 86 |  | 86 |  |  |
Issuance under equity incentive plans, Shares |  | 21 |  |  |  |
Issuance under equity incentive plans, Value | 235 |  | 235 |  |  |
Tax benefits from employee stock plans | 586 |  | 586 |  |  |
Stock-based compensation | 384 |  | 384 |  |  |
Repurchases of common stock, shares |  | (99) |  |  |  |
Repurchases of common stock, value | (10,338) | $ (1) | (222) |  | (10,115) |
Warrants settlement | (3,865) |  | (3,031) |  | (834) |
Convertible notes settlement | (782) |  | (782) |  |  |
Convertible note hedges settlement | 784 |  | 784 |  |  |
Dividends declared | (1,890) |  |  |  | (1,890) |
Reclassification to equity component of currently redeemable convertible notes | 13 |  | 13 |  |  |
Common Stock, Shares, Ending period at Dec. 31, 2015 |  | 1,422 |  |  |  |
Ending Balance at Dec. 31, 2015 | 19,113 | $ 1 | 444 | 88 | 18,001 | 579
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Change in noncontrolling interest | (90) |  |  |  |  | (90)
Net income (loss) | 13,488 |  |  |  | 13,501 | (13)
Other comprehensive loss, net of tax | 190 |  |  | 190 |  |
Issuances under employee stock purchase plan, Shares |  | 1 |  |  |  |
Issuances under employee stock purchase plan, Value | 84 |  | 84 |  |  |
Issuance under equity incentive plans, Shares |  | 13 |  |  |  |
Issuance under equity incentive plans, Value | 128 |  | 128 |  |  |
Tax benefits from employee stock plans | 186 |  | 186 |  |  |
Stock-based compensation | 381 |  | 381 |  |  |
Repurchases of common stock, shares |  | (126) |  |  |  |
Repurchases of common stock, value | (11,185) | $ 0 | (302) |  | (10,883) |
Warrants settlement | (469) |  | (469) |  |  |
Convertible notes settlement | (95) |  | (95) |  |  |
Convertible note hedges settlement | 95 |  | 95 |  |  |
Dividends declared | (2,465) |  |  |  | (2,465) |
Reclassification of conversion spread of convertible notes | (733) |  | (733) |  |  |
Reclassification of convertible note hedges | 733 |  | 733 |  |  |
Reclassification to equity component of currently redeemable convertible notes | $ 2 |  | 2 |  |  |
Common Stock, Shares, Ending period at Dec. 31, 2016 | 1,310 | 1,310 |  |  |  |
Ending Balance at Dec. 31, 2016 | $ 19,363 | $ 1 | 454 | 278 | 18,154 | 476
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Change in noncontrolling interest | (436) |  | (3) |  |  | (433)
Net income (loss) | 4,644 |  |  |  | 4,628 | 16
Other comprehensive loss, net of tax | (113) |  |  | (113) |  |
Issuances under employee stock purchase plan, Shares |  | 1 |  |  |  |
Issuances under employee stock purchase plan, Value | 83 |  | 83 |  |  |
Issuance under equity incentive plans, Shares |  | 11 |  |  |  |
Issuance under equity incentive plans, Value | 146 |  | 146 |  |  |
Stock-based compensation | 618 |  | 618 |  |  |
Repurchases of common stock, shares |  | (14) |  |  |  |
Repurchases of common stock, value | (1,062) |  | (34) |  | (1,028) |
Dividends declared | $ (2,742) |  |  |  | (2,742) |
Common Stock, Shares, Ending period at Dec. 31, 2017 | 1,308 | 1,308 |  |  |  |
Ending Balance at Dec. 31, 2017 | $ 20,501 | $ 1 | $ 1,264 | $ 165 | $ 19,012 | $ 59

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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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=27012166&loc=d3e187085-122770 + Details
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