New Accounting Standards	12 Months Ended
Dec. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards [Text Block]	Note 2—Changes in Accounting Principles We adopted the provisions of FASB ASU No. 2016-02, “Leases,” (ASC Topic 842) and its amendments, beginning January 1, 2019. ASC Topic 842 establishes comprehensive accounting and financial reporting requirements for leasing arrangements, supersedes the existing requirements in FASB ASC Topic 840, “Leases” (ASC Topic 840), and requires lessees to recognize substantially all lease assets and lease liabilities on the balance sheet. The provisions of ASC Topic 842 also modify the definition of a lease and outline requirements for recognition, measurement, presentation and disclosure of leasing arrangements by both lessees and lessors. We adopted ASC Topic 842 using the modified retrospective approach and elected to utilize the Optional Transition Method, which permits us to apply the provisions of ASC Topic 842 to leasing arrangements existing at or entered into after January 1, 2019, and present in our financial statements comparative periods prior to January 1, 2019 under the historical requirements of ASC Topic 840. In addition, we elected to adopt the package of optional transition-related practical expedients, which among other things, allows us to carry forward certain historical conclusions reached under ASC Topic 840 regarding lease identification, classification, and the accounting treatment of initial direct costs. Furthermore, we elected not to record assets and liabilities on our consolidated balance sheet for new or existing lease arrangements with terms of 12 months or less. The primary impact of applying ASC Topic 842 is the initial recognition of $ 998 million of lease liabilities and corresponding right-of-use assets on our consolidated balance sheet as of January 1, 2019, for leases classified as operating leases under ASC Topic 840, as well as enhanced disclosure of our leasing arrangements. Our accounting treatment for finance leases remains unchanged. In addition, there is no cumulative effect to retained earnings or other components of equity recognized as of January 1, 2019, and the adoption of ASC Topic 842 did not impact the presentation of our consolidated income statement or statement of cash flows. See Note 17—Non-Mineral Leases for additional information related to the adoption of ASC Topic 842. We adopted the provisions of FASB ASU No. 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income,” beginning January 1, 2019. The ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act, eliminating the stranded tax effects. The cumulative effect to our consolidated balance sheet at January 1, 2019 for the adoption of ASU No. 2018-02 was as follows: Millions of Dollars Note 26—New Accounting Standards In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments” (ASU No. 2016-13), which sets forth the current expected credit loss model, a new forward-looking impairment model for certain financial instruments based on expected losses rather than incurred losses. The ASU is effective for interim and annual periods beginning after December 15, 2019. Entities are required to adopt ASU No. 2016-13 using a modified retrospective approach, subject to certain limited exceptions. The impact of adopting this ASU is not expected to be material to our financial statements.

Note 2—Changes in Accounting Principles

We adopted the provisions of FASB ASU No. 2016-02, “Leases,” (ASC Topic 842) and its amendments,

beginning January 1, 2019.

ASC Topic 842 establishes comprehensive accounting and financial reporting

requirements for leasing arrangements, supersedes

the existing requirements in FASB ASC Topic 840,

“Leases” (ASC Topic 840), and requires lessees to recognize substantially

all lease assets and lease liabilities

on the balance sheet.

The provisions of ASC Topic 842 also modify the definition of a lease

and outline

requirements for recognition, measurement, presentation

and disclosure of leasing arrangements by

both

lessees and lessors.

We adopted ASC Topic

842 using the modified retrospective

approach and elected to utilize the Optional

Transition Method, which permits us to apply the provisions

of ASC Topic 842 to leasing arrangements

existing at or entered into after January 1, 2019,

and present in our financial statements comparative

periods

prior to January 1, 2019 under the historical

requirements of ASC Topic 840.

In addition, we elected to adopt

the package of optional transition-related practical

expedients, which among other things, allows us to

carry

forward certain historical conclusions reached

under ASC Topic 840 regarding lease identification,

classification, and the accounting treatment

of initial direct costs.

Furthermore, we elected not to record assets

and liabilities on our consolidated balance sheet

for new or existing lease arrangements

with terms of 12

months or less.

The primary impact of applying ASC Topic 842 is the initial recognition

of $

998

million of lease liabilities and

corresponding right-of-use assets on our consolidated

balance sheet as of January 1, 2019, for leases

classified

as operating leases under ASC Topic 840, as well as enhanced disclosure of our leasing

arrangements.

Our

accounting treatment for finance leases remains

unchanged.

In addition, there is no cumulative effect to

retained earnings or other components of equity

recognized as of January 1, 2019, and the adoption

of ASC

Topic 842 did not impact the presentation of our consolidated income statement

or statement of cash flows.

See Note 17—Non-Mineral Leases for additional

information related to the adoption of ASC Topic 842.

We adopted the provisions of FASB ASU No. 2018-02, “Reclassification of Certain Tax Effects from

Accumulated Other Comprehensive Income,”

beginning January 1, 2019.

The ASU allows a reclassification

from accumulated other comprehensive income

to retained earnings for stranded tax effects resulting

from the

Tax Cuts and Jobs Act, eliminating the stranded tax effects.

The cumulative effect to our consolidated balance

sheet at January 1, 2019 for the adoption of

ASU No. 2018-02 was as follows:

Note 26—New Accounting Standards

In June 2016, the FASB issued ASU No. 2016-13, “Measurement of Credit Losses on

Financial Instruments”

(ASU No. 2016-13), which sets forth the current

expected credit loss model, a new forward-looking

impairment model for certain financial instruments

based on expected losses rather than incurred losses.

The

ASU is effective for interim and annual periods beginning

after December 15, 2019.

Entities are required to

adopt ASU No. 2016-13 using a modified retrospective

approach, subject to certain limited exceptions.

The

impact

of adopting this ASU is not expected to be material

to our financial statements.