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Business and Basis of Presentation Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2023
Jan. 01, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Income (loss) before income taxes and equity in earnings of operating joint ventures $ 3,072 $ (1,892) $ 10,835    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income (loss) before income taxes and equity in earnings of operating joint ventures 3,072 (1,892) 10,835    
General and administrative expenses(1)(2) [1] 12,951 12,576 [2] 13,609 [2]    
Restructuring Charges 200        
Retained earnings(2) 32,352 31,714 [3],[4]      
Redeemable Noncontrolling Interest, Equity, Fair Value $ 524 371      
Prismic HoldCo          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Carrying value       $ 200  
Equity Method Investment, Ownership Percentage       20.00%  
Held-for-sale | Retirement Full Service          
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Income (loss) before income taxes and equity in earnings of operating joint ventures   (220) 180    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income (loss) before income taxes and equity in earnings of operating joint ventures   (220) 180    
General and administrative expenses(1)(2)   50      
Effect of Change          
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Income (loss) before income taxes and equity in earnings of operating joint ventures   (116) 1,454    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income (loss) before income taxes and equity in earnings of operating joint ventures   (116) 1,454    
General and administrative expenses(1)(2)   83 $ 27    
Retained earnings(2)   $ (1,678)      
Effect of Change | Accounting Standards Update 2018-12          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Retained earnings(2)         $ 402
[1] See Note 24 for additional information regarding related party transactions.
[2] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[3] See Note 24 for additional information regarding related party transactions.
[4] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.