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Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Shares | Non-Controlling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2015 |  | $ 561 | $ 861 | $ 11,302 | $ (4,220) | $ (1,991) | $ 89
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Change in accrued stock compensation costs |  |  | (10) |  |  |  |
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact in 2016 |  |  | (62) |  |  | 225 |
Net income | $ 970 |  |  | 953 |  |  | 17
Dividend equivalents declared – (per share amounts: $1.06 in 2017 and $0.96 in 2016) |  |  |  | (4) |  |  |
Dividends declared – (per share amounts: $1.06 in 2017 and $0.96 in 2016) |  |  |  | (500) |  |  |
Other comprehensive income, net of tax | (81) |  |  |  | (81) |  |
Purchase of treasury shares |  |  |  |  |  | (410) |
Deconsolidation of subsidiary |  |  |  |  |  |  | (14)
Distributions and other changes |  |  |  |  |  |  | (11)
Balance, end of period at Jun. 30, 2016 | 6,705 |  | 789 | 11,751 | (4,301) | (2,176) | 81
Balance, beginning of year at Dec. 31, 2016 | 6,272 | $ 561 | 842 | 12,388 | (5,093) | (2,506) | 80
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Change in accrued stock compensation costs |  |  | (10) |  |  |  |
Issuance of shares under stock compensation plans and employee stock purchase plans and related tax impact in 2016 |  |  | (69) |  |  | 201 |
Net income | 1,085 |  |  | 1,070 |  |  | 15
Dividend equivalents declared – (per share amounts: $1.06 in 2017 and $0.96 in 2016) |  |  |  | (2) |  |  |
Dividends declared – (per share amounts: $1.06 in 2017 and $0.96 in 2016) |  |  |  | (541) |  |  |
Other comprehensive income, net of tax | 552 |  |  |  | 552 |  |
Purchase of treasury shares |  |  |  |  |  | (400) |
Deconsolidation of subsidiary |  |  |  |  |  |  | 0
Distributions and other changes |  |  |  |  |  |  | (14)
Balance, end of period at Jun. 30, 2017 | $ 7,074 |  | $ 763 | $ 12,915 | $ (4,541) | $ (2,705) | $ 81

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