Commitments and Contigencies (Tables)

12 Months Ended

Dec. 31, 2017

Table Text Block [Abstract]

Minimum aggregate rental commitment under noncancelable operating leases

As of December 31, 2017, the minimum aggregate rental commitment under all non-cancelable operating leases (net of subleases of $20 million) was as follows:

(Millions)
2018	$	131
2019		124
2020		98
2021		72
2022		57
Thereafter		831
Total	$	1,313