Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Current assets: | ||
| Derivative Asset, Current | $ 1 | |
| Recurring | ||
| Current assets: | ||
| Cash equivalents | $ 272 | 267 |
| Derivative Asset, Current | 0 | 5 |
| Long-term liabilities: | ||
| Debt (note 8) | 5,116 | 4,758 |
| Derivative Liability | 0 | |
| Recurring | Level 1 | ||
| Current assets: | ||
| Cash equivalents | 272 | 267 |
| Long-term liabilities: | ||
| Debt (note 8) | 760 | 189 |
| Derivative Liability | 0 | |
| Recurring | Level 2 | ||
| Current assets: | ||
| Derivative Asset, Current | 0 | 5 |
| Long-term liabilities: | ||
| Debt (note 8) | 4,356 | $ 4,569 |
| Derivative Liability | $ 0 |
| X | ||||||||||
- Definition Current Assets, Fair Value Disclosure [Abstract] No definition available.
|
| X | ||||||||||
- Definition Long-term Liabilities, Fair Value Disclosure [Abstract] No definition available.
|
| X | ||||||||||
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. No definition available.
|
| X | ||||||||||
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|