Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Significant Accounting Policies

Estimated Useful Lives of Assets

Estimated Useful Lives of Assets

in years	Estimated Useful Life
Buildings	39
Leasehold improvements—Building	term of lease to 25
Leasehold improvements—Other	term of lease to 15
Furniture and fixtures	7
Computer and communications equipment	3 to 9
Power generation assets	15 to 29
Terminals, pipelines and equipment	3 to 30
Software costs	2 to 10