Recently Issued Accounting Standards (Notes)	12 Months Ended
Dec. 31, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recently Issued Accounting Standards	Recently Issued Accounting Standards Accounting Standards Adopted in Prior Periods ASU 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09") Upon adoption of ASU 2016-09, the Company recorded a cumulative-effect adjustment which included an increase to total shareholders’ equity of $140 million as of January 1, 2017 and the recognition of excess tax benefits in deferred tax assets that were previously not recognized. ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”) Upon adoption of ASU 2014-09, the Company recorded a cumulative-effect adjustment which included an increase to total shareholders’ equity of $38 million as of January 1, 2018. ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16") The Company identified a $31 million increase to total shareholders' equity and corresponding increase to deferred tax assets related to the adoption of ASU 2016-16, which was recorded during the year ended December 31, 2018. Accounting Standards Adopted January 1, 2019 ASU No. 2016-02, Leases (“ASU 2016-02”) In February 2016, the FASB issued ASU 2016-02 which requires lessees to recognize almost all leases on their balance sheet as a lease asset and a lease liability. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification is based on criteria largely similar to the criteria applied under legacy lease accounting, but without explicit bright lines. The Company adopted ASU 2016-02 using the modified retrospective approach with a cumulative-effect adjustment recorded at the beginning of the period of adoption (January 1, 2019). Therefore, the Company recognized and measured operating leases on the consolidated balance sheet without revising comparative period information or disclosure. At transition, the Company elected the package of practical expedients permitted under the transition guidance within the standard, which eliminates the reassessment of past leases, classification and initial direct costs. The Company did not elect to use hindsight to reassess lease terms or impairment at the adoption date. The Company elected the land easements practical expedient which allows the Company not to retrospectively treat land easements as leases; however, must apply lease accounting prospectively to land easements if they meet the definition of a lease. The Company implemented internal controls and key system functionality to enable the preparation of financial information on adoption. The new standard resulted in the recording of leased assets and lease liabilities for the Company’s operating leases of approximately $1.1 billion and $1.2 billion, respectively, as of January 1, 2019. The difference between the leased assets and lease liabilities primarily represents the prior year end deferred rent liabilities balance, resulting from historical straight-lining of operating leases, which was effectively reclassified upon adoption to reduce the measurement of the leased assets. The adoption of the standard did not have an impact on the Company’s shareholders equity, results from operations and cash flows. The adoption of the new standard resulted in additional interim and annual lease disclosures. See Note 8. ASU No. 2018-13, Changes to the Disclosure Requirements for Fair Value Measurement ("ASU 2018-13") In August 2018, the FASB issued ASU 2018-13 which amends fair value measurement disclosure requirements to eliminate, add and modify certain disclosures to improve the effectiveness of such disclosure in the notes to the financial statements. ASU 2018-13 will be effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted. The Company early adopted ASU 2018-13 on January 1, 2019. The adoption of ASU 2018-13 did not have a material impact to the Company's consolidated financial statements. ASU No. 2018-14, Changes to the Disclosure Requirements for Defined Benefit Plans ("ASU 2018-14") In August 2018, the FASB issued ASU 2018-14 which amends defined benefit plan disclosure requirements to eliminate, add and modify certain disclosures to improve the effectiveness of such disclosure in the notes to the financial statements. ASU 2018-14 will be effective for interim and annual periods beginning after December 15, 2021. Early adoption is permitted. The Company early adopted ASU 2018-14 on January 1, 2019. The adoption of ASU 2018-14 did not have a material impact to the Company's consolidated financial statements. ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (“ASU 2017-04”) In January 2017, the FASB issued ASU 2017-04 which eliminates step two from the goodwill impairment test. Under the new standard, to the extent the carrying amount of a reporting unit exceeds the fair value, the Company will record an impairment charge equal to the difference. ASU 2017-04 will be effective for interim and annual periods beginning after December 15, 2019. The Company elected to early adopt ASU 2017-04 in connection with the completion of its November 30, 2019 annual impairment assessment. The adoption of ASU 2017-04 did not have a material impact to the Company's consolidated financial statements. Accounting Standards Adopted January 1, 2020 ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”) In June 2016, the FASB issued ASU 2016-13, which requires a financial asset (or a group of financial assets) measured at amortized cost basis to be assessed for impairment under the current expected credit loss model rather than an incurred loss model. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions and reasonable and supportable forecasts that affect the collectability of the reported amount. The primary financial assets of the Company in scope of ASU 2016-13 include accounts receivables and equipment installment plan notes receivables. The Company adopted ASU 2016-13 on January 1, 2020. The adoption of ASU 2016-13 did not have a material impact to the Company's consolidated financial statements. ASU No. 2018-15, Customer’s Accounting for Implementation Costs in a Cloud Computing Arrangement That Is a Service Contract ("ASU 2018-15") In August 2018, the FASB issued ASU 2018-15 which requires upfront implementation costs incurred in a cloud computing arrangement (or hosting arrangement) that is a service contract to be amortized to hosting expense over the term of the arrangement, beginning when the module or component of the hosting arrangement is ready for its intended use. The Company adopted ASU 2018-15 on January 1, 2020. The adoption of ASU 2018-15 did not have a material impact to the Company's consolidated financial statements. ASU No. 2019-02, Improvements to Accounting for Costs of Films and License Agreements for Program Materials ("ASU 2019-02") In March 2019, the FASB issued ASU 2019-02 which aligns the accounting for production costs of an episodic television series with the accounting for production costs of films regarding cost capitalization, amortization, impairment, presentation and disclosure. The Company adopted ASU 2019-02 on January 1, 2020. The adoption of ASU 2019-02 did not have a material impact to the Company's consolidated financial statements. Accounting Standards Not Yet Adopted ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”) In December 2019, the FASB issued ASU 2019-12, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 will be effective for interim and annual periods beginning after December 15, 2020 (January 1, 2021 for the Company). Early adoption is permitted. The Company is currently evaluating the impact the adoption of ASU 2019-12 will have on its consolidated financial statements.

Upon adoption of ASU 2016-09, the Company recorded a cumulative-effect adjustment which included an increase to total shareholders’ equity of $140 million as of January 1, 2017 and the recognition of excess tax benefits in deferred tax assets that were previously not recognized.

The Company identified a $31 million increase to total shareholders' equity and corresponding increase to deferred tax assets related to the adoption of ASU 2016-16, which was recorded during the year ended December 31, 2018.

In February 2016, the FASB issued ASU 2016-02 which requires lessees to recognize almost all leases on their balance sheet as a lease asset and a lease liability. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification is based on criteria largely similar to the criteria applied under legacy lease accounting, but without explicit bright lines.

The Company adopted ASU 2016-02 using the modified retrospective approach with a cumulative-effect adjustment recorded at the beginning of the period of adoption (January 1, 2019). Therefore, the Company recognized and measured operating leases on the consolidated balance sheet without revising comparative period information or disclosure. At transition, the Company elected the package of practical expedients permitted under the transition guidance within the standard, which eliminates the reassessment of past leases, classification and initial direct costs. The Company did not elect to use hindsight to reassess lease terms or impairment at the adoption date. The Company elected the land easements practical expedient which allows the Company not to retrospectively treat land easements as leases; however, must apply lease accounting prospectively to land easements if they meet the definition of a lease.

The Company implemented internal controls and key system functionality to enable the preparation of financial information on adoption. The new standard resulted in the recording of leased assets and lease liabilities for the Company’s operating leases of approximately $1.1 billion and $1.2 billion, respectively, as of January 1, 2019. The difference between the leased assets and lease liabilities primarily represents the prior year end deferred rent liabilities balance, resulting from historical straight-lining of operating leases, which was effectively reclassified upon adoption to reduce the measurement of the leased assets. The adoption of the standard did not have an impact on the Company’s shareholders equity, results from operations and cash flows. The adoption of the new standard resulted in additional interim and annual lease disclosures. See Note 8.

In August 2018, the FASB issued ASU 2018-13 which amends fair value measurement disclosure requirements to eliminate, add and modify certain disclosures to improve the effectiveness of such disclosure in the notes to the financial statements. ASU 2018-13

will be effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted. The Company early adopted ASU 2018-13 on January 1, 2019. The adoption of ASU 2018-13 did not have a material impact to the Company's consolidated financial statements.

In August 2018, the FASB issued ASU 2018-14 which amends defined benefit plan disclosure requirements to eliminate, add and modify certain disclosures to improve the effectiveness of such disclosure in the notes to the financial statements. ASU 2018-14 will be effective for interim and annual periods beginning after December 15, 2021. Early adoption is permitted. The Company early adopted ASU 2018-14 on January 1, 2019. The adoption of ASU 2018-14 did not have a material impact to the Company's consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04 which eliminates step two from the goodwill impairment test. Under the new standard, to the extent the carrying amount of a reporting unit exceeds the fair value, the Company will record an impairment charge equal to the difference. ASU 2017-04 will be effective for interim and annual periods beginning after December 15, 2019. The Company elected to early adopt ASU 2017-04 in connection with the completion of its November 30, 2019 annual impairment assessment. The adoption of ASU 2017-04 did not have a material impact to the Company's consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, which requires a financial asset (or a group of financial assets) measured at amortized cost basis to be assessed for impairment under the current expected credit loss model rather than an incurred loss model. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions and reasonable and supportable forecasts that affect the collectability of the reported amount. The primary financial assets of the Company in scope of ASU 2016-13 include accounts receivables and equipment installment plan notes receivables. The Company adopted ASU 2016-13 on January 1, 2020. The adoption of ASU 2016-13 did not have a material impact to the Company's consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15 which requires upfront implementation costs incurred in a cloud computing arrangement (or hosting arrangement) that is a service contract to be amortized to hosting expense over the term of the arrangement, beginning when the module or component of the hosting arrangement is ready for its intended use. The Company adopted ASU 2018-15 on January 1, 2020. The adoption of ASU 2018-15 did not have a material impact to the Company's consolidated financial statements.

In March 2019, the FASB issued ASU 2019-02 which aligns the accounting for production costs of an episodic television series with the accounting for production costs of films regarding cost capitalization, amortization, impairment, presentation and disclosure. The Company adopted ASU 2019-02 on January 1, 2020. The adoption of ASU 2019-02 did not have a material impact to the Company's consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing