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Short-Term and Long-Term Debt (Long-Term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 19,730 $ 19,718
Surplus notes | Fixed-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 343 343
Surplus notes subject to set-off arrangements | Fixed-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 7,934 8,134
Surplus notes subject to set-off arrangements | Floating-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 2,330 2,330
Senior notes | Fixed-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 11,182 11,179
Mortgages | Fixed-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 24 24
Mortgages | Floating-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 268 257
Line of Credit    
Debt Instrument [Line Items]    
Long-term Line of Credit, Noncurrent 300 300
Junior subordinated notes    
Debt Instrument [Line Items]    
Long-term debt 7,613 7,615
Subtotal    
Debt Instrument [Line Items]    
Long-term debt 29,994 30,182
Less: assets under set-off arrangements    
Debt Instrument [Line Items]    
Long-term debt 10,264 10,464
Debt denominated in foreign currency | Mortgages | Floating-rate notes:    
Debt Instrument [Line Items]    
Long-term debt 31 29
Prudential Financial    
Debt Instrument [Line Items]    
Long-term debt 18,565 18,561
Prudential Financial | Junior subordinated notes    
Debt Instrument [Line Items]    
Long-term debt 7,556 7,554
Subsidiaries | Junior subordinated notes    
Debt Instrument [Line Items]    
Long-term debt $ 57 $ 60