Equity (Liability Award Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Aug. 07, 2017	Aug. 04, 2017
Summary of performance share activity
Share Price		$ 48.17	$ 53.92
Stock Options
Summary of performance share activity
Exercised Shares Under Option	(3,475,198)
Stock Options | Minimum
Summary of performance share activity
Vesting period	1 year
Stock Options | Maximum
Summary of performance share activity
Vesting period	3 years
Performance Shares
Summary of performance share activity
Shares Outstanding at January 1,	3,817,100
Granted Shares	1,225,333
Forfeited Shares	(270,292)
Paid	(1,192,734)
Other Separation adjustment	454,353
Shares Outstanding at December 31,	4,033,760
Vested and expected to vest at December 31,	3,971,002
Restricted Stock Units
Summary of performance share activity
Shares Outstanding at January 1,	3,422,013
Granted Shares	1,445,238
Forfeited Shares	(251,216)
Paid	(1,720,168)
Other Separation adjustment	408,510
Shares Outstanding at December 31,	3,304,377
Vested and expected to vest at December 31,	3,246,476
Vesting period	3 years
Liability Awards Plan | Stock Options
Summary of performance share activity
Shares Outstanding at January 1,	855,897
Granted Shares	24,175
Exercised Shares Under Option	(200,687)
Forfeited Shares	(100,439)
Paid	0
Other Separation adjustment	102,066
Shares Outstanding at December 31,	681,012
Vested and expected to vest at December 31,	612,911
Liability Awards Plan | Performance Shares
Summary of performance share activity
Shares Outstanding at January 1,	615,356
Granted Shares	238,487
Exercised Shares Under Option	0
Forfeited Shares	(53,499)
Paid	(185,178)
Other Separation adjustment	73,063
Shares Outstanding at December 31,	688,229
Vested and expected to vest at December 31,	619,406
Liability Awards Plan | Restricted Stock Units
Summary of performance share activity
Shares Outstanding at January 1,	763,723
Granted Shares	375,414
Exercised Shares Under Option	0
Forfeited Shares	(82,940)
Paid	(368,049)
Other Separation adjustment	90,928
Shares Outstanding at December 31,	779,076
Vested and expected to vest at December 31,	701,168