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Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019
June2006 Hybrids |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  | $ 111 |
September 2006 hybrids |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 13
Debt, amount redeemed |  |  |  |  | 286 |
June 2006 and September 2006 Hybrids |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date, description |  | both of which would have otherwise matured in 2066 |  |  |  |
2.579% Junior Subordinated Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Rate |  | 2.579% |  |  |  |
Debt, amount redeemed |  |  | $ 7 |  |  |
Debt maturity month and year |  | 2020-07 |  |  |  |
Debt instrument prepaid, amount | $ 993 |  |  |  |  |
DS C A N A |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date, description |  | The notes would have otherwise matured in May 2021 and February 2022, respectively. |  |  |  |
DS C A N A | Floating rate senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 66 |  |
Debt instrument, maturity date, description |  | The notes would have otherwise matured in June 2034 |  |  |  |
DS C A N A | Four Point Seven Five Percent Medium Term Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 183 |
Interest Rate |  |  |  |  | 4.75% |
DS C A N A | Four Point One Two Five Percent Medium Term Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 155 |
Interest Rate |  |  |  |  | 4.125% |
Term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Estimated mandatory prepayments due within one year |  | $ 22 |  |  |  |

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