Shareholders' Equity (Preferred Stock) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Carrying value, Preferred stock	$ 440	$ 440
Preferred stock, Authorized (in shares)	4,400,000	4,400,000
Series A | SOFR
Schedule of Equity Method Investments [Line Items]
Preferred stock dividend rate basis spread on variable rate	0.78%
Series G | SOFR
Schedule of Equity Method Investments [Line Items]
Preferred stock dividend rate basis spread on variable rate	4.50%
Series I | SOFR
Schedule of Equity Method Investments [Line Items]
Preferred stock dividend rate basis spread on variable rate	4.06%
Series J | SOFR
Schedule of Equity Method Investments [Line Items]
Preferred stock dividend rate basis spread on variable rate	4.70%
Parent | Series A
Schedule of Equity Method Investments [Line Items]
Carrying value, Preferred stock	$ 67	$ 67
Preferred stock, Authorized (in shares)	140,000,000
Preferred stock, Outstanding (in shares)	66,139,000
Preferred stock dividend rate	4.00%
Earliest redemption date	Dec. 15, 2011
Parent | Series G
Schedule of Equity Method Investments [Line Items]
Carrying value, Preferred stock	$ 138	138
Preferred stock, Authorized (in shares)	200,000,000
Preferred stock, Outstanding (in shares)	138,390,000
Earliest redemption date	Mar. 15, 2023
Parent | Series I
Schedule of Equity Method Investments [Line Items]
Carrying value, Preferred stock	$ 99	99
Preferred stock, Authorized (in shares)	300,893,000
Preferred stock, Outstanding (in shares)	98,555,000
Earliest redemption date	Jun. 15, 2023
Parent | Series J
Schedule of Equity Method Investments [Line Items]
Carrying value, Preferred stock	$ 136	$ 136
Preferred stock, Authorized (in shares)	195,152,000
Preferred stock, Outstanding (in shares)	136,368,000
Earliest redemption date	Sep. 15, 2023