Change in Accounting Principles	3 Months Ended
Mar. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Changes in Accounting Principles [Text Block]	Note 2—Changes in Accounting Principles We adopted the provisions of FASB ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” (ASC Topic 326) and its amendments, beginning January 1, 2020 . This ASU, as amended, sets forth the current expected credit loss model, a new forward-looking impairment model for certain financial instruments measured at amortized cost basis based on expected losses rather than incurred losses. This ASU, as amended, which primarily applies to our accounts receivable, also requires credit losses related to available- for-sale debt securities to be recorded through an allowance for credit losses. The adoption of this ASU did not have a material impact to our financial statements. The majority of our receivables are due within 30 days or less. We monitor the credit quality of our counterparties through review of collections, credit ratings, and other analyses. We develop our estimated allowance for credit losses primarily using an aging method and analyses of historical loss rates as well as consideration of current and future conditions that could impact our counterparties’ credit quality and liquidity.

Note 2—Changes in Accounting Principles

adopted

the provisions of FASB ASU No. 2016-13, “Measurement of Credit Losses

on Financial

Instruments,” (ASC Topic 326) and its amendments,

beginning

January 1, 2020

This ASU, as amended, sets

forth the current expected credit loss model,

a new forward-looking impairment model

for certain financial

instruments measured at amortized cost basis

based on expected losses rather than incurred losses.

This ASU,

as amended, which primarily applies to our accounts

receivable, also requires credit losses related

to available-

for-sale debt securities to be recorded through an allowance

for credit losses.

The adoption of this ASU did

not have a material impact to our financial statements.

The majority of our receivables are due within

30 days

or less.

We monitor the credit quality of our counterparties through review of collections,

credit ratings, and

other analyses.

We develop our estimated allowance for credit losses primarily using an aging method

and

analyses of historical loss rates as well as consideration

of current and future conditions that could impact

our

counterparties’ credit quality and liquidity.