Subsequent Event (Details) - Subsequent Event - Senior Notes $ in Billions	Oct. 27, 2022 USD ($)
Parent Company | Fixed Rate/Floating Rate Senior Notes Due October 27, 2028
Subsequent Event [Line Items]
Principal amount	$ 1
Parent Company | Fixed Rate/Floating Rate Senior Notes Due October 27, 2028 | One year prior to maturity date
Subsequent Event [Line Items]
Redemption period	1 year
Parent Company | Fixed Rate/Floating Rate Senior Notes Due October 27, 2028 | 30 days prior to maturity date
Subsequent Event [Line Items]
Redemption period	30 days
Parent Company | Fixed Rate/Floating Rate Senior Notes Due October 27, 2028 | 180 days after issue date
Subsequent Event [Line Items]
Redemption period	180 days
Parent Company | 6.361% Fixed Rate Senior Notes Due October 27, 2028
Subsequent Event [Line Items]
Interest rate	6.361%
Parent Company | Floating Rate Senior Notes Due October 27, 2028 | SOFR
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)	2.192%
Parent Company | Floating Rate Senior Notes Due October 27, 2028 | SOFR | Interest rate swap
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)	2.193%
Subsidiaries | Fixed Rate/Floating Rate Senior Notes Due October 27, 2025
Subsequent Event [Line Items]
Principal amount	$ 1
Subsidiaries | Fixed Rate/Floating Rate Senior Notes Due October 27, 2025 | One year prior to maturity date
Subsequent Event [Line Items]
Redemption period	1 year
Subsidiaries | Fixed Rate/Floating Rate Senior Notes Due October 27, 2025 | 30 days prior to maturity date
Subsequent Event [Line Items]
Redemption period	30 days
Subsidiaries | 5.852% Fixed Rate Senior Notes Due October 27, 2025
Subsequent Event [Line Items]
Interest rate	5.852%
Subsidiaries | Floating Rate Senior Notes Due October 27, 2025 | SOFR
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)	1.23%
Subsidiaries | Floating Rate Senior Notes Due October 27, 2025 | SOFR | Interest rate swap
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)	1.218%