Commitments and Contingencies Leases (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

As of December 31, 2017, future minimum lease payments under our non-cancelable operating leases are as follows over each of the next five years and thereafter (in millions):

2018	$	8,775
2019	5,907
2020	4,059
2021	3,214
2022	3,105
Thereafter	6,446
Total	$	31,506