Debt Debt (Narrative) (Details) - USD ($)	Apr. 14, 2020	Dec. 04, 2015	Apr. 10, 2020	Apr. 02, 2020	Mar. 23, 2020	Mar. 22, 2020
MetLife
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity					$ 300,000,000	$ 150,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 850,000,000
Debt instrument term		5 years
Subsequent Event | Prudential
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 425,000,000
Subsequent Event | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000
Debt instrument term	3 years
Line of credit facility, increase limit	$ 250,000,000
Line of credit facility, higher borrowing capacity option	1,250,000,000
MetLife 2030 Series D Notes | Senior Notes | Subsequent Event
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 125,000,000
Stated interest rate				2.50%
Prudential 2030 Series D Notes | Senior Notes | Subsequent Event
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 75,000,000
Stated interest rate	2.50%		2.50%