Employee Benefit Plans (Multiemployer Plan) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
Multiemployer Plans [Line Items] | |||
Multiemployer Plans General Nature | The risks of participating in these multiemployer plans are different from single-employer plans in that assets contributed are pooled and may be used to provide benefits to employees of other participating employers. If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. Lastly, if we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans a withdrawal liability based on the underfunded status of the plan. | ||
Multiemployer Plans Period Contributions | $ 120 | $ 113 | $ 105 |
Multiemployer Plans Period Contributions Other Than Pensions | $ 15 | $ 14 | 12 |
National Elevator Industry Plan [Member] | |||
Multiemployer Plans [Line Items] | |||
Entity Tax Identification Number | 232694291 | ||
Multiemployer Plans Certified Zone Status | Green | Green | |
Multiemployer Plans Funding Improvement Plan And Rehabilitation Plan | No | ||
Multiemployer Plans Period Contributions | $ 88 | $ 79 | 71 |
Multiemployer Plans Surcharge | No | ||
Multiemployer Plans Collective Bargaining Arrangement Expiration Date | Jul. 08, 2017 | ||
Multiemployer Plans, Period Contributions, Significance of Contributions | 1 | 1 | |
Other Funds [Member] | |||
Multiemployer Plans [Line Items] | |||
Multiemployer Plans Period Contributions | $ 32 | $ 34 | $ 34 |