New Accounting Pronouncements	3 Months Ended
Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements Revenue recognition – In May 2014, the Financial Accounting Standards Board (FASB) issued new revenue recognition guidance to provide a single, comprehensive revenue recognition model for all contracts with customers. Under the new guidance, an entity will recognize revenue to depict the transfer of promised goods or services to customers at an amount that the entity expects to be entitled to in exchange for those goods or services. A five step model has been introduced for an entity to apply when recognizing revenue. The new guidance also includes enhanced disclosure requirements. The guidance was effective January 1, 2018 and was applied on a modified retrospective basis. The adoption did not have a material impact on our financial statements. Recognition and measurement of financial assets and financial liabilities – In January 2016, the FASB issued accounting guidance that affects the accounting for equity investments, financial liabilities accounted for under the fair value option and the presentation and disclosure requirements for financial instruments. Under the new guidance, all equity investments in unconsolidated entities (other than those accounted for using the equity method of accounting) will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification for equity securities with readily determinable fair values. For financial liabilities when the fair value option has been elected, changes in fair value due to instrument-specific credit risk will be recognized separately in other comprehensive income. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The guidance was effective January 1, 2018 and was applied on a modified retrospective basis. The adoption did not have a material impact on our financial statements. Lease accounting – In February 2016, the FASB issued accounting guidance that revises the accounting for leases. Under the new guidance, lessees are required to recognize a right-of-use asset and a lease liability for substantially all leases. The new guidance will continue to classify leases as either financing or operating, with classification affecting the pattern of expense recognition. The accounting applied by a lessor under the new guidance will be substantially equivalent to current lease accounting guidance except for certain targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model. The new guidance is effective January 1, 2019, with early adoption permitted. The new standard is required to be applied with a modified retrospective approach to each prior reporting period presented and provides for certain practical expedients. An implementation team is currently designing new processes and controls and evaluating our population of leased assets to assess the effect of the new guidance on our financial statements. We also have a team evaluating the impact of the changes to lessor accounting. We plan to adopt the new guidance effective January 1, 2019. Measurement of credit losses on financial instruments – In June 2016, the FASB issued accounting guidance to introduce a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The new guidance will apply to loans, accounts receivable, trade receivables, other financial assets measured at amortized cost, loan commitments and other off-balance sheet credit exposures. The new guidance will also apply to debt securities and other financial assets measured at fair value through other comprehensive income. The new guidance is effective January 1, 2020, with early adoption permitted beginning January 1, 2019. We are in the process of evaluating the effect of the new guidance on our financial statements. Classification for certain cash receipts and cash payments – In August 2016, the FASB issued accounting guidance related to the presentation and classification of certain transactions in the statement of cash flows where diversity in practice exists. The guidance was effective January 1, 2018 and was applied on a retrospective basis. The adoption did not have a material impact on our financial statements. Classification of restricted cash – In November 2016, the FASB issued accounting guidance related to the presentation and classification of changes in restricted cash on the statement of cash flows where diversity in practice exists. The guidance was effective January 1, 2018 and was applied on a retrospective basis. The adoption did not have a material impact on our financial statements. Derivatives and hedging – In August 2017, the FASB issued accounting guidance to better align hedge accounting with a company’s risk management activities, simplify the application of hedge accounting and improve the disclosures of hedging arrangements. The new guidance is required to be applied on a modified retrospective basis, resulting in a cumulative-effect adjustment to opening retained earnings in the period of adoption. The guidance is effective January 1, 2019, with early adoption permitted. We have completed the evaluation of the impact of the new standard and do not expect the adoption to have a material impact on our financial statements. Reclassification of certain tax effects from accumulated other comprehensive income – In February 2018, the FASB issued accounting guidance to allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from U.S. tax reform legislation. The new guidance is required to be applied either in the period of adoption or retrospectively to each period affected by U.S. tax reform legislation. The guidance is effective January 1, 2019, with early adoption permitted. We are in the process of evaluating the effect of the new guidance on our financial statements.

New Accounting Pronouncements

Revenue recognition – In May 2014, the Financial Accounting Standards Board (FASB) issued new revenue recognition guidance to provide a single, comprehensive revenue recognition model for all contracts with customers. Under the new guidance, an entity will recognize revenue to depict the transfer of promised goods or services to customers at an amount that the entity expects to be entitled to in exchange for those goods or services. A five step model has been introduced for an entity to apply when recognizing revenue. The new guidance also includes enhanced disclosure requirements. The guidance was effective January 1, 2018 and was applied on a modified retrospective basis. The adoption did not have a material impact on our financial statements.

Recognition and measurement of financial assets and financial liabilities – In January 2016, the FASB issued accounting guidance that affects the accounting for equity investments, financial liabilities accounted for under the fair value option and the presentation and disclosure requirements for financial instruments. Under the new guidance, all equity investments in unconsolidated entities (other than those accounted for using the equity method of accounting) will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification for equity securities with readily determinable fair values. For financial liabilities when the fair value option has been elected, changes in fair value due to instrument-specific credit risk will be recognized separately in other comprehensive income. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The guidance was effective January 1, 2018 and was applied on a modified retrospective basis. The adoption did not have a material impact on our financial statements.

Lease accounting – In February 2016, the FASB issued accounting guidance that revises the accounting for leases. Under the new guidance, lessees are required to recognize a right-of-use asset and a lease liability for substantially all leases. The new guidance will continue to classify leases as either financing or operating, with classification affecting the pattern of expense recognition. The accounting applied by a lessor under the new guidance will be substantially equivalent to current lease accounting guidance except for certain targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model. The new guidance is effective January 1, 2019, with early adoption permitted. The new standard is required to be applied with a modified retrospective approach to each prior reporting period presented and provides for certain practical expedients. An implementation team is currently designing new processes and controls and evaluating our population of leased assets to assess the effect of the new guidance on our financial statements. We also have a team evaluating the impact of the changes to lessor accounting. We plan to adopt the new guidance effective January 1, 2019.

Measurement of credit losses on financial instruments – In June 2016, the FASB issued accounting guidance to introduce a new model for recognizing credit losses on financial instruments based on an estimate of current expected credit losses. The new guidance will apply to loans, accounts receivable, trade receivables, other financial assets measured at amortized cost, loan commitments and other off-balance sheet credit exposures. The new guidance will also apply to debt securities and other financial assets measured at fair value through other comprehensive income. The new guidance is effective January 1, 2020, with early adoption permitted beginning January 1, 2019. We are in the process of evaluating the effect of the new guidance on our financial statements.

Classification for certain cash receipts and cash payments – In August 2016, the FASB issued accounting guidance related to the presentation and classification of certain transactions in the statement of cash flows where diversity in practice exists. The guidance was effective January 1, 2018 and was applied on a retrospective basis. The adoption did not have a material impact on our financial statements.

Classification of restricted cash – In November 2016, the FASB issued accounting guidance related to the presentation and classification of changes in restricted cash on the statement of cash flows where diversity in practice exists. The guidance was effective January 1, 2018 and was applied on a retrospective basis. The adoption did not have a material impact on our financial statements.

Derivatives and hedging – In August 2017, the FASB issued accounting guidance to better align hedge accounting with a company’s risk management activities, simplify the application of hedge accounting and improve the disclosures of hedging arrangements. The new guidance is required to be applied on a modified retrospective basis, resulting in a cumulative-effect adjustment to opening retained earnings in the period of adoption. The guidance is effective January 1, 2019, with early adoption permitted. We have completed the evaluation of the impact of the new standard and do not expect the adoption to have a material impact on our financial statements.

Reclassification of certain tax effects from accumulated other comprehensive income – In February 2018, the FASB issued accounting guidance to allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from U.S. tax reform legislation. The new guidance is required to be applied either in the period of adoption or retrospectively to each period affected by U.S. tax reform legislation. The guidance is effective January 1, 2019, with early adoption permitted. We are in the process of evaluating the effect of the new guidance on our financial statements.