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