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Goodwill, Customer Relationships and Other Intangible Assets - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2021 | Jan. 01, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Impairment loss | $ 0 |  |  |  |
Amortization of intangible assets |  |  | $ 425,000,000 | $ 431,000,000 |
Intangible assets, gross (including goodwill) |  |  | 41,600,000,000 |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Amortization of intangible assets |  |  | 425,000,000 | 431,000,000 |
Net income |  |  | $ (475,000,000) | $ (314,000,000) |
Basic earnings per common share (in dollars per share) |  |  | $ (0.44) | $ (0.29) |
Diluted earnings per common share (in dollars per share) |  |  | $ (0.44) | $ (0.29) |
Reclassification of intangible assets |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Amortization of intangible assets |  |  | $ 7,000,000 |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Amortization of intangible assets |  |  | 7,000,000 |  |
Net income |  |  | $ 5,000,000 |  |
Reclassification of intangible assets | Forecast |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Amortization of intangible assets |  |  |  |  | $ 30,000,000
Change in Accounting Estimate [Line Items] |  |  |  |  |
Amortization of intangible assets |  |  |  |  | 30,000,000
Net income |  |  |  |  | $ 23,000,000
Basic earnings per common share (in dollars per share) |  |  |  |  | $ 0.02
Diluted earnings per common share (in dollars per share) |  |  |  |  | $ 0.02
Reclassification of intangible assets | Right-of-way |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Finite-lived intangible assets |  | $ 268,000,000 |  |  |
Remaining amortization period |  | 9 years |  |  |

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