Debt (Tower Securities - Schedule of Material Terms of Debt Outstanding) (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Amount Outstanding	$ 12,388,000,000	$ 12,952,000,000
2014-2C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Oct. 15, 2014
Amount Outstanding	$ 620,000,000	620,000,000
Interest Rate	3.869%
Anticipated Repayment Date	Oct. 08, 2024
Final Maturity Date	Oct. 08, 2049
Financing fees	$ 9,000,000.0
2019-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Sep. 13, 2019
Amount Outstanding	$ 1,165,000,000	1,165,000,000
Interest Rate	2.836%
Anticipated Repayment Date	Jan. 12, 2025
Final Maturity Date	Jan. 12, 2050
Financing fees	$ 12,800,000
2020-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Jul. 14, 2020
Amount Outstanding	$ 750,000,000	750,000,000
Interest Rate	1.884%
Anticipated Repayment Date	Jan. 09, 2026
Final Maturity Date	Jul. 11, 2050
Financing fees	$ 8,000,000.0
2020-2C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Jul. 14, 2020
Amount Outstanding	$ 600,000,000	600,000,000
Interest Rate	2.328%
Anticipated Repayment Date	Jan. 11, 2028
Final Maturity Date	Jul. 09, 2052
Financing fees	$ 6,400,000
2021-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	May 14, 2021
Amount Outstanding	$ 1,165,000,000	1,165,000,000
Interest Rate	1.631%
Anticipated Repayment Date	Nov. 09, 2026
Final Maturity Date	May 09, 2051
Financing fees	$ 12,900,000
2021-2C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Oct. 27, 2021
Amount Outstanding	$ 895,000,000	895,000,000
Interest Rate	1.84%
Anticipated Repayment Date	Apr. 09, 2027
Final Maturity Date	Oct. 10, 2051
Financing fees	$ 9,500,000
2021-3C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Oct. 27, 2021
Amount Outstanding	$ 895,000,000	895,000,000
Interest Rate	2.593%
Anticipated Repayment Date	Oct. 09, 2031
Final Maturity Date	Oct. 10, 2056
Financing fees	$ 9,500,000
2022-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Nov. 23, 2022
Amount Outstanding	$ 850,000,000	$ 850,000,000
Interest Rate	6.599%
Anticipated Repayment Date	Jan. 11, 2028
Final Maturity Date	Nov. 09, 2052
Financing fees	$ 10,500,000
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Mar. 09, 2018
Amount Outstanding	$ 640,000,000.0
Interest Rate	3.448%
Anticipated Repayment Date	Mar. 09, 2023
Financing fees	$ 8,600,000

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