Schedule I - Condensed Financial Information of Parent (Senior Notes and Junior Subordinated Notes) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	$ 3,754	$ 3,447
Recourse Debt Non Current	3,729	3,446
Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	3,729
Debt Maturity Year One [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	25
Debt Maturity Year One [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	0
Debt Maturity Year Two [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	0
Debt Maturity Year Two [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	0
Debt Maturity Year Three [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	0
Debt Maturity Year Three [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	0
Debt Maturity Year Four [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	900
Debt Maturity Year Four [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	900
Debt Maturity Year Five [Member]
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	1,165
Debt Maturity Year Five [Member] | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	1,165
Thereafter
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	1,700
Thereafter | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Total	1,700
Recourse Debt Excluding Junior Subordinated Debt | Parent Company
Condensed Financial Statements, Captions [Line Items]
Recourse Debt Non Current	$ 3,729	$ 3,430