Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 25, 2016
Commitments and Contingencies Disclosure [Abstract]
Standby letters of credit and guarantees outstanding	$ 226,000,000	$ 272,000,000
Subsidiary payment obligations demand for payment				$ 0
Total Minimum Commitments [Abstract]
2017	1,201,092,000
2018	934,037,000
2018	673,452,000
2020	460,178,000
2020	334,601,000
2022 and beyond	674,287,000
Total Minimum Commitments	4,277,647,000
Rental expenses associated with existing leases	$ 204,000,000	$ 229,000,000	$ 237,000,000