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Long-Term Debt (Narrative) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2024 | Jun. 30, 2019 | Feb. 29, 2020 | Aug. 31, 2019 | Jul. 31, 2017 | Sep. 30, 2006 | Jun. 30, 2006 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 14, 2019 | May 31, 2017 | Aug. 31, 2016 | Jul. 31, 2016 | Oct. 31, 2014 | Jul. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  | $ 2,200 |  |  |  |  |  |  |  |
Aggregate outstanding principal of senior notes |  |  |  |  |  |  |  | 2,200 |  |  |  |  |  |  |  |
Make-whole premium |  |  |  |  |  |  |  | $ 34 |  |  |  |  |  |  |  |
Period of deferral |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 18.5 |  |  |  | 6.1 |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  | $ 9,116 | $ 5,682 | $ 1,572 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Per Share Under Stock Purchase Contract |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |
Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment percentage rate on Equity Units |  |  |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  | 6.375%
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  | 12.5 |  |  |  |  |  |
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  | $ 1,600 |  |  |  |  |
Shares to be issued under purchase contracts |  | 21.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Per Share Under Stock Purchase Contract |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |
Senior Note Redemptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  | $ 69 |  |  |  |  |  |  |  |
Senior Note Redemptions | Series A 4.45% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  | 4.45% |  |  |  |  |  |  |  |
Senior Note Redemptions | Series B 2.50% Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |
Senior Note Redemptions | Series C 3.625% Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  | 3.625% |  |  |  |  |  |  |  |
July 2016 Hybrids | Unsecured junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800 |  |
Remarketable Subordinated Notes | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |
Principal amount of notes |  | $ 700 |  |  |  |  |  |  |  |  |  | $ 1,000 | $ 1,400 |  |  | $ 1,000
Issuance of common stock (in shares) |  |  |  |  | 12.5 |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes | Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  | 3.071% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 18.5 |  |  |  |  |  |  |  |  |  |  |  |
Series A Junior Subordinated Notes | Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  | 2.715% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Junior Subordinated Notes | Unsecured junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  | 2.579% |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
June 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption price paid |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 2006 hybrids | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 111 |  |  |  |  |  |  |  |  |  |  |  |  |
June 2006 hybrids | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate |  |  |  |  |  |  | 2.825% |  |  |  |  |  |  |  |  |
September 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |
September 2006 hybrids | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 286 |  |  |  |  |  |  |  |  |  |  |  |  |
September 2006 hybrids | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate |  |  |  |  |  | 2.30% |  |  |  |  |  |  |  |  |  |
October 2014 Hybrids | Unsecured junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 685 |
October 2014 Hybrids | July 2016 Hybrids | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate | 3.057% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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