Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Statement of Stockholders' Equity [Abstract] | ||||||||
| Cash dividends declared per share (in $ per share) | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 1.35 | $ 1.35 |