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Business and Basic Presentation (Narrative) (Details)
$ in Millions, ₩ in Trillions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 01, 2021
Aug. 31, 2020
USD ($)
Aug. 31, 2020
KRW (₩)
Aug. 11, 2020
USD ($)
Aug. 11, 2020
TWD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Other income $ 282,000,000 $ (2,591,000,000)              
The Prudential Life Insurance Company of Korea, Ltd. | Discontinued Operations, Held for Sale                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Cash considerations for sale of a business           $ 1,900,000,000 ₩ 2.3    
Other income       $ (800,000,000)          
The Prudential Life Insurance Company of Taiwan Inc. | Discontinued Operations, Held for Sale                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Cash considerations for sale of a business               $ 195,000,000 $ 5,500
Other income     $ (390,000,000)            
Business Combination, Contingent Consideration, Asset               30,000,000  
The Prudential Life Insurance Company of Taiwan Inc. | Discontinued Operations, Held for Sale | Maximum                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Business Combination, Contingent Consideration, Asset               $ 100,000,000  
Prudential International Insurance Holdings LTD | Disposal Group, Disposed of by Sale, Not Discontinued Operations                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Other income $ 330,000,000                
Equity Method Investment, Ownership Percentage         35.00%