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Consolidated Statements of Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 5,467 | $ 1,157 | $ 2,718 | $ (132) | $ 973 | $ 688 | $ 63
Repurchase of common stock | (62) |  |  | (62) |  |  |
Stock-based compensation expense | 125 |  | 125 | 53 | (53) |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 1,293 |  |  |  | 1,287 |  | 6
Other comprehensive income (loss), net of tax | (179) |  |  |  |  | (179) |
Comprehensive income (loss) | 1,114 |  |  |  |  |  |
Dividends to noncontrolling interest | (4) |  |  |  |  |  | (4)
Dividends | (216) |  |  |  | (216) |  |
Ending Balance at Dec. 31, 2018 | 6,424 | 1,157 | 2,843 | (141) | 1,991 | 509 | 65
Contribution of noncontrolling interest | 8 |  |  |  |  |  | 8
Business combination | 61 |  |  |  |  |  | 61
Repurchase of noncontrolling interest | (61) |  | 4 |  |  |  | (65)
Repurchase of common stock | (250) |  |  | (250) |  |  |
Stock-based compensation expense | 145 |  | 145 | 63 | (63) |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 1,033 |  |  |  | 1,032 |  | 1
Other comprehensive income (loss), net of tax | (34) |  |  |  |  | (34) |
Comprehensive income (loss) | 999 |  |  |  |  |  |
Dividends to noncontrolling interest | (2) |  |  |  |  |  | (2)
Dividends | (213) |  |  |  | (213) |  |
Ending Balance at Dec. 31, 2019 | 7,111 | 1,157 | 2,992 | (328) | 2,747 | 475 | 68
Repurchase of common stock | (125) |  |  | (125) |  |  |
Issuance of senior convertible bonds | 184 |  | 184 |  |  |  |
Settlement of senior convertible bonds | (11) |  | (269) | 258 |  |  |
Stock-based compensation expense | 155 |  | 155 | 102 | (102) |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 1,108 |  |  |  | 1,106 |  | 2
Other comprehensive income (loss), net of tax | 248 |  |  |  |  | 248 |
Comprehensive income (loss) | 1,356 |  |  |  |  |  |
Dividends to noncontrolling interest | (12) |  |  |  |  |  | (12)
Dividends | (152) |  |  |  | (152) |  |
Ending Balance at Dec. 31, 2020 | $ 8,506 | $ 1,157 | $ 3,062 | $ (93) | $ 3,599 | $ 723 | $ 58

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