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Long-term Debt and Finance Leases -Senior Credit Facility, Credit Default Swap Facility and Bilateral letter of Credit Facilities (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 04, 2019 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2021
Credit Agreement 2019 | Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Increase in revolving commitments and letters of credit |  |  | $ 150,000,000 |
Revolving credit facility | $ 80,000,000 |  |  |
Annual facility fees, percentage | 1.33% |  |  |
Letter of credit |  |  |  | $ 222,000,000
Bilateral letter of credit facilities | Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility |  |  | 475,000,000 |
Letter of credit |  |  |  | 469,000,000
Bilateral letter of credit facilities | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility |  |  | $ 475,000,000 |
Line of Credit | Credit Agreement | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Increase in revolving commitments and letters of credit |  | $ 802,000,000 |  |
Revolving credit facility |  | $ 273,000,000 |  |
Revolving commitments available |  |  |  | $ 3,700,000,000

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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Increase + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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- Details
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