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Quarterly Consolidated Financial Information - Schedule of Quarterly Consolidated Financial Information (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |
Losses (gains) on sales of facilities | $ 305 |  | $ 14 | $ 1 | $ 6 | $ 5 | $ 8
Losses on retirement of debt |  | $ 162 |  |  |  | $ 7 |

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- Definition Gain (loss) on disposition of assets net of tax. + References No definition available. + Details
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- Definition Gain Loss On Extinguishment Of Debt, Net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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