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Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions | Common Stock | Treasury Stock | Shares Held in Trust | Capital Surplus | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Parent | Noncontrolling Interest | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year (in shares) at Dec. 31, 2014 | 1,691,000 | (550,000) | (1,000) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stock options exercised and issuance of stock awards | 8,000 |  |  |  |  |  |  |  |  |
Purchase of treasury shares (in shares) |  | (48,000) |  |  |  |  |  |  |  |
Employee stock purchase plan issuances (in shares) |  | 1,000 |  |  |  |  |  |  |  |
Balance at end of year (in shares) at Dec. 31, 2015 | 1,699,000 | (597,000) | (1,000) |  |  |  |  |  |  |
Beginning of year at Dec. 31, 2014 | $ 17 | $ (24,078) | $ (31) | $ 30,418 | $ 31,849 | $ (217) |  | $ 5 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  | (4,856) |  |  |  |  |  |  |  |
Employee stock purchase plan issuances |  | 48 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  |  |  | 533 |  |  |  |  |  |
Excess tax benefit on stock options and stock awards |  |  |  | 142 |  |  |  |  |  |
2015 accelerated share repurchase not settled until 2016 |  |  |  | (145) |  |  |  |  |  |
Changes in inventory accounting principles |  |  |  |  | (4) |  |  |  |  |
Net income attributable to CVS Health |  |  |  |  | 5,237 |  |  | 1 | [1] |
Common stock dividends |  |  |  |  | (1,576) |  |  |  |  |
Foreign currency translation adjustments, net of tax |  |  |  |  |  | (100) |  |  |  | $ (100)
Net cash flow hedges, net of tax |  |  |  |  |  | 2 |  |  |  | 2
Pension and other postretirement benefits, net of tax |  |  |  |  |  | (43) |  |  |  | (43)
Business combinations |  |  |  |  |  |  |  | 1 |  |
Capital contributions |  |  |  |  |  |  |  | 2 |  |
Net income attributable to redeemable noncontrolling interest |  |  |  |  |  |  |  | 1 |  |
Distributions |  |  |  |  |  |  |  | (2) |  |
End of year at Dec. 31, 2015 | $ 17 | $ (28,886) | $ (31) | 30,948 | 35,506 | (358) | $ 37,196 | 7 |  | 37,203
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stock options exercised and issuance of stock awards | 6,000 |  |  |  |  |  |  |  |  |
Purchase of treasury shares (in shares) |  | (47,000) |  |  |  |  |  |  |  |
Employee stock purchase plan issuances (in shares) |  | 1,000 |  |  |  |  |  |  |  |
Balance at end of year (in shares) at Dec. 31, 2016 | 1,705,000 | (643,000) | (1,000) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  | $ (4,606) |  |  |  |  |  |  |  |
Employee stock purchase plan issuances |  | 40 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  |  |  | 449 |  |  |  |  |  |
Excess tax benefit on stock options and stock awards |  |  |  | 76 |  |  |  |  |  |
2015 accelerated share repurchase not settled until 2016 |  |  |  | 145 |  |  |  |  |  |
Net income attributable to CVS Health |  |  |  |  | 5,317 |  |  | 1 | [1] |
Common stock dividends |  |  |  |  | (1,840) |  |  |  |  |
Foreign currency translation adjustments, net of tax |  |  |  |  |  | 38 |  |  |  | 38
Net cash flow hedges, net of tax |  |  |  |  |  | 2 |  |  |  | 2
Pension and other postretirement benefits, net of tax |  |  |  |  |  | 13 |  |  |  | 13
Capital contributions |  |  |  |  |  |  |  | 1 |  |
Net income attributable to redeemable noncontrolling interest |  |  |  |  |  |  |  | 1 |  |
Distributions |  |  |  |  |  |  |  | (5) |  |
End of year at Dec. 31, 2016 | $ 17 | $ (33,452) | $ (31) | 31,618 | 38,983 | (305) | 36,830 | 4 |  | $ 36,834
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Stock options exercised and issuance of stock awards | 7,000 |  |  |  |  |  |  |  |  | 4,814
Purchase of treasury shares (in shares) |  | (55,000) |  |  |  |  |  |  |  |
Employee stock purchase plan issuances (in shares) |  | 1,000 |  |  |  |  |  |  |  |
Balance at end of year (in shares) at Dec. 31, 2017 | 1,712,000 | (697,000) | (1,000) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares |  | $ (4,361) |  |  |  |  |  |  |  |
Employee stock purchase plan issuances |  | 48 |  |  |  |  |  |  |  |
Stock option activity, stock awards and other |  |  |  | 461 |  |  |  |  |  |
Net income attributable to CVS Health |  |  |  |  | 6,622 |  |  | 1 |  |
Common stock dividends |  |  |  |  | (2,049) |  |  |  |  |
Foreign currency translation adjustments, net of tax |  |  |  |  |  | (2) |  |  |  | $ (2)
Net cash flow hedges, net of tax |  |  |  |  |  | (10) |  |  |  | (10)
Pension and other postretirement benefits, net of tax |  |  |  |  |  | 152 |  |  |  | 152
Capital contributions |  |  |  |  |  |  |  | 1 |  |
Distributions |  |  |  |  |  |  |  | (2) |  |
End of year at Dec. 31, 2017 | $ 17 | $ (37,765) | $ (31) | $ 32,079 | $ 43,556 | $ (165) | $ 37,691 | $ 4 |  | $ 37,695
[1] | Excludes $1 million attributable to redeemable noncontrolling interest in 2016 and 2015 (See Note 1 "Significant Accounting Policies")

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