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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Regulatory Assets [Line Items] |
Schedule of Regulatory Liabilities [Table Text Block] | Regulatory assets and liabilities consist of the following (dollars in millions):
| Remaining Amortization Period |  | As of December 31,
| 2019 |  | 2018
| Earning a Return (1) |  | Not Earning a Return |  | Total |  | Total
Regulatory assets: |  |  |  |  |  |  |  |  |
Price risk management | 2035 |  | $ | — |  |  | $ | 95 |  |  | $ | 95 |  |  | $ | 131 |
Pension and other postretirement plans | (2) |  | — |  |  | 213 |  |  | 213 |  |  | 222 |
Debt issuance costs | 2049 |  | — |  |  | 26 |  |  | 26 |  |  | 16 |
Trojan decommissioning activities | 2059 |  | — |  |  | 94 |  |  | 94 |  |  | 26 |
Other | Various |  | 62 |  |  | 10 |  |  | 72 |  |  | 67 |
Total regulatory assets |  |  | $ | 62 |  |  | $ | 438 |  |  | $ | 500 |  |  | $ | 462 |
Regulatory liabilities: |  |  |  |  |  |  |  |  |
Asset retirement removal costs | (3) |  | $ | 1,021 |  |  | $ | — |  |  | $ | 1,021 |  |  | $ | 979 |
Deferred income taxes | (4) |  | 260 |  |  | — |  |  | 260 |  |  | 267 |
Asset retirement obligations | (3) |  | 54 |  |  | — |  |  | 54 |  |  | 53 |
Tax reform deferral (5) | 2020 |  | 23 |  |  | — |  |  | 23 |  |  | 45 |
Other | Various |  | 47 |  |  | 16 |  |  | 63 |  |  | 47 |
Total regulatory liabilities |  |  | $ | 1,405 |  |  | $ | 16 |  |  | $ | 1,421 |  |  | $ | 1,391 |
(1) | Earning a return includes either interest on the regulatory asset or liability, or inclusion of the regulatory asset or liability as an increase or decrease to rate base at the allowed rate of return.
(2) | Recovery expected over the average service life of employees.
(3) | Recovery or refund expected over the estimated lives of the underlying assets and treated as a reduction to rate base.
(4) | Refund expected primarily through amortization using the average rate assumption method over the average life of the underlying assets and treated as a reduction to rate base.
(5) | Refund related to the deferral of the 2018 net tax benefits due to the change in corporate tax rate under TCJA, including interest, over a two-year period that began in 2019.
Schedule of Regulatory Assets [Table Text Block] | Regulatory assets and liabilities consist of the following (dollars in millions):
| Remaining Amortization Period |  | As of December 31,
| 2019 |  | 2018
| Earning a Return (1) |  | Not Earning a Return |  | Total |  | Total
Regulatory assets: |  |  |  |  |  |  |  |  |
Price risk management | 2035 |  | $ | — |  |  | $ | 95 |  |  | $ | 95 |  |  | $ | 131 |
Pension and other postretirement plans | (2) |  | — |  |  | 213 |  |  | 213 |  |  | 222 |
Debt issuance costs | 2049 |  | — |  |  | 26 |  |  | 26 |  |  | 16 |
Trojan decommissioning activities | 2059 |  | — |  |  | 94 |  |  | 94 |  |  | 26 |
Other | Various |  | 62 |  |  | 10 |  |  | 72 |  |  | 67 |
Total regulatory assets |  |  | $ | 62 |  |  | $ | 438 |  |  | $ | 500 |  |  | $ | 462 |
Regulatory liabilities: |  |  |  |  |  |  |  |  |
Asset retirement removal costs | (3) |  | $ | 1,021 |  |  | $ | — |  |  | $ | 1,021 |  |  | $ | 979 |
Deferred income taxes | (4) |  | 260 |  |  | — |  |  | 260 |  |  | 267 |
Asset retirement obligations | (3) |  | 54 |  |  | — |  |  | 54 |  |  | 53 |
Tax reform deferral (5) | 2020 |  | 23 |  |  | — |  |  | 23 |  |  | 45 |
Other | Various |  | 47 |  |  | 16 |  |  | 63 |  |  | 47 |
Total regulatory liabilities |  |  | $ | 1,405 |  |  | $ | 16 |  |  | $ | 1,421 |  |  | $ | 1,391 |
(1) | Earning a return includes either interest on the regulatory asset or liability, or inclusion of the regulatory asset or liability as an increase or decrease to rate base at the allowed rate of return.
(2) | Recovery expected over the average service life of employees.
(3) | Recovery or refund expected over the estimated lives of the underlying assets and treated as a reduction to rate base.
(4) | Refund expected primarily through amortization using the average rate assumption method over the average life of the underlying assets and treated as a reduction to rate base.
(5) Refund related to the deferral of the 2018 net tax benefits due to the change in corporate tax rate under TCJA, including interest, over a two-year period that began in 2019.

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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