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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%