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Share-Based Compensation And Other Compensation Arrangements	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation And Other Compensation Arrangements	Share-Based Compensation and Other Compensation Arrangements Restricted Stock Units On February 26, 2018, we granted to our executives 260,730 restricted stock units (RSUs) as part of our long-term incentive program with a grant date fair value of $361.13 per unit. The RSUs granted under this program will vest and settle in common stock (on a one-for-one basis) on the third anniversary of the grant date. Performance-Based Restricted Stock Units On February 26, 2018, we granted to our executives 241,284 performance-based restricted stock units (PBRSUs) as part of our long-term incentive program with a grant date fair value of $390.27 per unit. Compensation expense for the award is recognized over the three-year performance period based upon the grant date fair value estimated using a Monte-Carlo simulation model. The model used the following assumptions: expected volatility of 22.11% based upon historical stock volatility, a risk-free interest rate of 2.36%, and no expected dividend yield because the units earn dividend equivalents. Performance Awards On February 26, 2018, we granted to our executives performance awards as part of our long-term incentive program with a payout based on the achievement of financial goals for the three-year period ending December 31, 2020. At March 31, 2018, the minimum payout amount is $0 and the maximum amount we could be required to pay out is $375.