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Accounting for Derivative Instruments and Hedging Activities (Details) £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 GBP (£) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Gain (Loss) On Financial Instruments, Net |  |  |  |  |  |  |
Change in fair value of cross-currency derivative instruments | $ (85) | $ 61 | $ (22) | $ (365) |  |  |
Foreign currency remeasurement of Sterling Notes to U.S. dollars | (6) | 3 | (21) | 111 |  |  |
Gain (loss) on financial instruments, net | $ (91) | $ 64 | $ (43) | $ (254) |  |  |
Cross Currency Derivatives |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |
Notional amount | £ |  |  |  |  | £ 1,275 |  |
Collateral holiday agreement, percentage of position covered |  |  |  |  | 60.00% | 60.00% |
Collateral holiday agreement, term |  |  | 3 years |  |  |  |
collateral cap term |  |  | 10 years |  |  |  |
Collateral cap, percentage of position covered |  |  |  |  | 40.00% | 40.00% |
Maximum amount of collateral required to be posted |  |  |  |  |  | $ 150 |
Collateral Holiday Agreement Percentage Extended to November 2022 |  |  |  |  | 20.00% | 20.00% |
Level 2 | Cross Currency Derivatives |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |
Derivative Liability |  |  |  |  |  | $ 206 | $ 184

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- Definition Gain (Loss) On Financial Instruments, Net [Abstract] + References No definition available. + Details
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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