Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 16 – Commitments and Contingencies Purchase Commitments We have commitments for non-dedicated transportation lines with varying expiration terms that generally extend through 2035. In addition, we have commitments to purchase and lease spectrum licenses, wireless devices, network services, equipment, software, marketing sponsorship agreements and other items in the ordinary course of business, with various terms through 2043. These amounts are not reflective of our entire anticipated purchases under the related agreements but are determined based on the non-cancelable quantities or termination amounts to which we are contractually obligated. Our purchase commitments are approximately $3.6 billion for the year ending December 31, 2020, $3.3 billion in total for the years ending December 31, 2021 and 2022, $1.6 billion in total for the years ending December 31, 2023 and 2024 and $1.4 billion in total for the years thereafter. In 2018, we signed a reciprocal long-term spectrum lease with Sprint. The lease includes an offsetting amount to be received from Sprint for the lease of our spectrum. Lease payments began in the fourth quarter of 2018. The minimum commitment under this lease as of December 31, 2019, is $481 million and is included in the purchase obligations above. The reciprocal long-term lease is a distinct transaction from the Merger. Under the previous lease standard certain of our network backhaul arrangements were accounted for as operating leases. Obligations under these agreements were included within our operating lease commitments as of December 31, 2018. These agreements no longer qualify as leases under the new lease standard. Our commitments under these agreements as of December 31, 2019, were approximately $164 million for the year ending December 31, 2020, $267 million in total for the years ended December 31, 2021 and 2022, $171 million in total for the years ended December 31, 2023 and 2024, and $196 million in total for years thereafter. The commitments under these agreements are included in the purchase commitments above. Interest rate lock derivatives We have entered into interest rate lock derivatives with notional amounts of $9.6 billion. These interest rate lock derivatives were designated as cash flow hedges to reduce variability in cash flows due to changes in interest payments attributable to increases or decreases in the benchmark interest rate during the period leading up to the probable issuance of fixed-rate debt. The fair value of interest rate lock derivatives as of December 31, 2019, was a liability of $1.2 billion and is included in Other current liabilities in our Consolidated Balance Sheets. See Note 7 – Fair Value Measurements for further information. Renewable Energy Purchase Agreements In April 2019, T-Mobile USA entered into a Renewable Energy Purchase Agreement (“REPA”) with a third party that is based on the expected operation of a solar photovoltaic electrical generation facility located in Texas and will remain in effect until the fifteenth anniversary of the facility’s entry into commercial operation. Commercial operation of the facility is expected to occur in July 2021. The REPA consists of an energy forward agreement that is net settled based on energy prices and the energy output generated by the facility. We have determined that the REPA does not meet the definition of a derivative because the expected energy output of the facility may not be reliably estimated (the arrangement lacks a notional amount). The REPA does not contain any unconditional purchase obligations because amounts under the agreement are not fixed and determinable. Our participation in the REPA did not require an upfront investment or capital commitment. We do not control the activities that most significantly impact the energy-generating facility, nor do we direct the use of, or receive specific energy output from, the facility. Contingencies and Litigation Litigation Matters On June 11, 2019, a number of state attorneys general filed a lawsuit against us, DT, Sprint, and SoftBank in the U.S. District Court for the Southern District of New York, alleging that the Merger, if consummated, would violate Section 7 of the Clayton Act and so should be enjoined. The trial concluded after two weeks of witness testimony and presentation of document evidence. We are now waiting for the trial court’s ruling. See Note 2 – Business Combinations for further information. In addition to the litigation associated with the Transactions discussed above, we are involved in various lawsuits and disputes, claims, government agency investigations and enforcement actions, and other proceedings (“Litigation Matters”) that arise in the ordinary course of business, which include claims of patent infringement (most of which are asserted by non-practicing entities primarily seeking monetary damages), class actions, and proceedings to enforce FCC rules and regulations. The Litigation Matters described above have progressed to various stages and some of them may proceed to trial, arbitration, hearing or other adjudication that could result in fines, penalties, or awards of monetary or injunctive relief in the coming 12 months if they are not otherwise resolved. We have established an accrual with respect to certain of these matters, where appropriate, which is reflected in the Consolidated Financial Statements but that is not considered to be, individually or in the aggregate, material. An accrual is established when we believe it is both probable that a loss has been incurred and an amount can be reasonably estimated. For other matters, where we have not determined that a loss is probable or because the amount of loss cannot be reasonably estimated, we have not recorded an accrual due to various factors typical in contested proceedings, including but not limited to uncertainty concerning legal theories and their resolution by courts or regulators, uncertain damage theories and demands, and a less than fully developed factual record. While we do not expect that the ultimate resolution of these proceedings, individually or in the aggregate, will have a material adverse effect on our financial position, an unfavorable outcome of some or all of these proceedings could have a material adverse impact on results of operations or cash flows for a particular period. This assessment is based on our current understanding of relevant facts and circumstances. As such, our view of these matters is subject to inherent uncertainties and may change in the future.