Borrowings and Credit Agreements - Long-term Borrowings (Details) - USD ($)						1 Months Ended	12 Months Ended
	Dec. 10, 2034	Mar. 10, 2030	Aug. 15, 2025	Dec. 10, 2024	May 09, 2024	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Proceeds from debt			$ 4,000,000,000	$ 3,000,000,000	$ 5,000,000,000
Cash payment of debt							$ 3,629,000,000	$ 4,773,000,000	$ 3,166,000,000
Gain on early extinguishment of debt							$ 0	$ 491,000,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Debt face amount					5,000,000,000
Principal amount of debt repaid						$ 2,600,000,000
Cash payment of debt						2,000,000,000.0
Gain on early extinguishment of debt						$ 491,000,000
Senior Notes | 5% senior notes due September 2032
Debt Instrument [Line Items]
Debt face amount			$ 750,000,000
Debt interest rate			5.00%				5.00%
Senior Notes | 5.45% senior notes due September 2035
Debt Instrument [Line Items]
Debt face amount			$ 1,500,000,000
Debt interest rate			5.45%				5.45%
Senior Notes | 6.2% senior notes due September 2055
Debt Instrument [Line Items]
Debt face amount			$ 1,250,000,000
Debt interest rate			6.20%				6.20%
Senior Notes | 6.25% senior notes due September 2065
Debt Instrument [Line Items]
Debt face amount			$ 500,000,000
Debt interest rate			6.25%				6.25%
Senior Notes | 5.4% senior notes due June 2029
Debt Instrument [Line Items]
Debt face amount					$ 1,000,000,000
Debt interest rate					5.40%		5.40%
Senior Notes | 5.55% senior notes due June 2031
Debt Instrument [Line Items]
Debt face amount					$ 1,000,000,000
Debt interest rate					5.55%		5.55%
Senior Notes | 5.7% senior notes due June 2034
Debt Instrument [Line Items]
Debt face amount					$ 1,250,000,000
Debt interest rate					5.70%		5.70%
Senior Notes | 6% senior notes due June 2044
Debt Instrument [Line Items]
Debt face amount					$ 750,000,000
Debt interest rate					6.00%		6.00%
Senior Notes | 6.05% senior notes due June 2054
Debt Instrument [Line Items]
Debt face amount					$ 1,000,000,000
Debt interest rate					6.05%		6.05%
Senior Notes | 4.1% senior notes due March 2025
Debt Instrument [Line Items]
Debt interest rate						4.10%		4.10%
Principal amount of debt repaid						$ 226,000,000
Senior Notes | 4.125% senior notes due April 2040
Debt Instrument [Line Items]
Debt interest rate						4.125%	4.125%	4.125%
Principal amount of debt repaid						$ 398,000,000
Senior Notes | 2.7% senior notes due August 2040
Debt Instrument [Line Items]
Debt interest rate						2.70%	2.70%	2.70%
Principal amount of debt repaid						$ 883,000,000
Senior Notes | 4.125% senior notes due November 2042
Debt Instrument [Line Items]
Debt interest rate						4.125%	4.125%	4.125%
Principal amount of debt repaid						$ 274,000,000
Senior Notes | 3.875% senior notes due August 2047
Debt Instrument [Line Items]
Debt interest rate						3.875%	3.875%	3.875%
Principal amount of debt repaid						$ 463,000,000
Senior Notes | 4.25% senior notes due April 2050
Debt Instrument [Line Items]
Debt interest rate						4.25%	4.25%	4.25%
Principal amount of debt repaid						$ 351,000,000
Junior Subordinated Debt | 7% series A junior subordinated notes due March 2055
Debt Instrument [Line Items]
Debt face amount				$ 2,250,000,000
Debt interest rate				7.00%			7.00%
Initial redemption period prior to first interest rate date				90 days
Junior Subordinated Debt | 7% series A junior subordinated notes due March 2055 | Forecast
Debt Instrument [Line Items]
Interest rate recurring reset period		5 years
Junior Subordinated Debt | 6.75% series B junior subordinated notes due December 2054
Debt Instrument [Line Items]
Debt face amount				$ 750,000,000
Debt interest rate				6.75%			6.75%
Initial redemption period prior to first interest rate date				90 days
Junior Subordinated Debt | 6.75% series B junior subordinated notes due December 2054 | Forecast
Debt Instrument [Line Items]
Interest rate recurring reset period	5 years