Unsecured Debt - Senior Unsecured Notes (Details) - USD ($)	Dec. 31, 2024	Aug. 31, 2024	Dec. 31, 2023	Jun. 30, 2020	Oct. 31, 2019	Aug. 31, 2019	Mar. 31, 2019	Feb. 28, 2019	Mar. 31, 2018	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2014
Debt Instrument [Line Items]
Debt instrument face amount	$ 5,200,000,000		$ 5,050,000,000
Unsecured Bonds 3.875%
Debt Instrument [Line Items]
Debt instrument face amount	$ 0		400,000,000
Unsecured Bonds 3.875% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount												$ 400,000,000.0
Coupon Rate	3.875%											3.875%
Unsecured Bonds 3.500%
Debt Instrument [Line Items]
Debt instrument face amount	$ 500,000,000		500,000,000
Unsecured Bonds 3.500% | Senior Notes
Debt Instrument [Line Items]
Coupon Rate	3.50%
Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Debt instrument face amount	$ 450,000,000		450,000,000
Unsecured Bonds 3.375% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount											$ 450,000,000.0
Coupon Rate	3.375%										3.375%
Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Debt instrument face amount	$ 350,000,000		350,000,000
Unsecured Bonds 3.625% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount										$ 350,000,000.0
Coupon Rate	3.625%									3.625%
Unsecured Bonds 1.700%
Debt Instrument [Line Items]
Debt instrument face amount	$ 450,000,000		450,000,000
Unsecured Bonds 1.700% | Senior Notes
Debt Instrument [Line Items]
Coupon Rate	1.70%
Unsecured Bonds 4.000%
Debt Instrument [Line Items]
Debt instrument face amount	$ 500,000,000		500,000,000
Unsecured Bonds 4.000% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount							$ 150,000,000.0	$ 350,000,000.0
Coupon Rate	4.00%							4.00%
Unsecured Bonds 3.000%
Debt Instrument [Line Items]
Debt instrument face amount	$ 550,000,000		550,000,000
Unsecured Bonds 3.000% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount					$ 150,000,000.0	$ 400,000,000.0
Coupon Rate	3.00%					3.00%
Unsecured Bonds 1.650%
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000		300,000,000
Unsecured Bonds 1.650% | Senior Notes
Debt Instrument [Line Items]
Coupon Rate	1.65%
Unsecured Bonds 2.550%
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000		300,000,000
Unsecured Bonds 2.550% | Senior Notes
Debt Instrument [Line Items]
Coupon Rate	2.55%
Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Debt instrument face amount	$ 650,000,000		650,000,000
Unsecured Bonds 2.650% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount				$ 150,000,000
Coupon Rate	2.65%
Unsecured Bonds 5.500%
Debt Instrument [Line Items]
Debt instrument face amount	$ 550,000,000		0
Unsecured Bonds 5.500% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount		$ 200,000,000
Coupon Rate	5.50%
Unsecured Bonds 4.500%
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000		300,000,000
Unsecured Bonds 4.500% | Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount									$ 300,000,000.0
Coupon Rate	4.50%								4.50%
Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Debt instrument face amount	$ 300,000,000		$ 300,000,000
Unsecured Bonds 2.650% | Senior Notes
Debt Instrument [Line Items]
Coupon Rate	2.65%