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Summary of Significant Accounting Policies | 6 Months Ended
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Jun. 30, 2021
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | Summary of Significant Accounting Policies Fair Value Measurements For assets and liabilities required to be reported at fair value, GAAP provides a hierarchy that prioritizes inputs to valuation techniques used to measure fair value into three broad levels. Level 1 inputs are based on unadjusted quoted prices in active markets for identical instruments. Level 2 inputs are inputs, other than quoted market prices included within Level 1, that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs for the asset or liability. As of June 30, 2021 and December 31, 2020, the carrying amounts of cash and cash equivalents, receivables and accounts payable approximated fair value due to the short-term nature of these instruments. Our liabilities measured at fair value were as follows:
| June 30, 2021 |  | December 31, 2020
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (a) | — |  |  | $ | 10,308 |  |  | — |  |  | $ | 10,308 |  |  | — |  |  | $ | 9,011 |  |  | — |  |  | $ | 9,011 |
(a)The fair value for non-publicly traded debt is based upon estimates from a market maker and brokerage firm. Refer to Note 13 for information related to the carrying value of our debt as of June 30, 2021 and December 31, 2020. Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income of $27 was primarily comprised of the cumulative foreign currency translation adjustments related to our investment in and loan to Sirius XM Canada (refer to Note 12 for additional information). During the three and six months ended June 30, 2021, we recorded foreign currency translation adjustment income of $7 and $12, respectively, net of tax expense of $2 and $4, respectively. During the three and six months ended June 30, 2020, we recorded foreign currency translation adjustment income (loss) of $10 and $(15), respectively, net of a tax (expense) benefit of $(3) and $5, respectively.

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- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123372394&loc=d3e18726-107790 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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