Goodwill	3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Goodwill was $1.13 billion at both March 31, 2019 and December 31, 2018. The difference between consideration paid for the business and the net fair value of assets and liabilities is recognized as goodwill. Goodwill is not amortized but is subject to impairment testing annually as of October 31 and on an interim basis if events or changes in circumstances indicate assets might be impaired. Impairment exists when the carrying value of goodwill exceeds its fair value. The Corporation’s most recent annual goodwill impairment review performed as of October 31, 2018 did not indicate that an impairment of goodwill existed. The Corporation also determined that no triggering events have occurred that indicated impairment from the most recent valuation date through March 31, 2019 and that the Corporation's goodwill was not impaired at March 31, 2019.

Goodwill

Goodwill was $1.13 billion at both March 31, 2019 and December 31, 2018. The difference between consideration paid for the business and the net fair value of assets and liabilities is recognized as goodwill.

Goodwill is not amortized but is subject to impairment testing annually as of October 31 and on an interim basis if events or changes in circumstances indicate assets might be impaired. Impairment exists when the carrying value of goodwill exceeds its fair value. The Corporation’s most recent annual goodwill impairment review performed as of October 31, 2018 did not indicate that an impairment of goodwill existed. The Corporation also determined that no triggering events have occurred that indicated impairment from the most recent valuation date through March 31, 2019 and that the Corporation's goodwill was not impaired at March 31, 2019.