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Stock Compensation - Effect on Shares Outstanding and Treasury Shares (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Treasury stock (in shares) | 744,831,978 | 729,547,527 | 694,189,127 | 658,012,970
Repurchases | 35,480,036 | 51,384,339 | 61,665,209 |
Total issued (in shares) | (20,181,998) | (16,018,408) | (25,481,874) |
Director |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Director deferred stock issued (in shares) | (13,587) | (7,531) | (7,178) |
Employee Stock Option |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Exercised (in shares) | (14,516,606) | (11,953,455) | (19,503,382) |
Stock applied to exercises or taxes | 0 | 8,562 | 6,618 |
Total issued (in shares) | (15,878,808) | (13,477,157) | (21,280,948) |
Employee Stock Option | Director |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Director deferred stock issued (in shares) | 0 | 0 | 0 |
Restricted Stock Units (RSUs) |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Vested RSUs (in shares) | (5,639,666) | (3,386,415) | (5,609,627) |
Stock applied to exercises or taxes | 1,336,476 | 845,164 | 1,408,701 |
Total issued (in shares) | (4,303,190) | (2,541,251) | (4,200,926) |
Restricted Stock Units (RSUs) | Director |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Director deferred stock issued (in shares) | 0 | 0 | 0 |
Employee stock purchase plan |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Exercised (in shares) | (1,362,202) |  |  |
Employee stock purchase plan | Employee Stock Option |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Exercised (in shares) | (1,362,202) | (1,532,264) | (1,784,184) |
Employee stock purchase plan | Restricted Stock Units (RSUs) |  |  |  |
Schedule of Changes in Treasury Stock [Line Items] |  |  |  |
Vested RSUs (in shares) | 0 | 0 | 0 |

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