XML 107 R88.htm IDEA: XBRL DOCUMENT v3.20.4
Commitments, Contingencies and Other Items - Right-of-Way Agreements (Details) - Right-of-Way Agreements
$ in Millions
Dec. 31, 2020
USD ($)
Other Commitments [Line Items]  
2021 $ 109
2022 63
2023 62
2024 51
2025 44
2026 and thereafter 284
Total future minimum payments $ 613