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Significant Accounting Policies and Pronouncements (Narratives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings(2) $ 32,352   $ 31,714 [1],[2]      
Accumulated other comprehensive income (loss) (6,504) [1]   (3,806) [2]      
Total equity $ 29,263   31,548 [3] $ 30,322 [3]   $ 68,210
Loan-to-value ratios (greater than) 100.00%          
Loan-to-value ratio (less than) 100.00%          
Debt service coverage ratios (less than) 1.0          
Repurchase and Resale Agreements, Collateral, Percentage 95.00%          
Uncertain Tax Positions Measurement Percentage (greater than) 50.00%          
Operating Lease, Right-of-Use Asset $ 286   340      
Operating Lease, Liability 311   370      
Accumulated Other Comprehensive Income (Loss)            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accumulated other comprehensive income (loss) (6,504)   (3,806) (9,493) $ (11,658) 30,738
Total equity (6,504)   (3,806) [3] (9,493) [3]   30,738
Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total equity   $ 16,000     (42,400)  
Retained Earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings(2)         28,137  
Total equity $ 32,352   $ 31,714 [3] $ 35,183 [3]   $ 30,749
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total equity   $ (1,700)     $ (2,600)  
United States | Securities Lending and Securities Repurchase Transactions            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Guarantor Obligations, Liquidation Proceeds, Percentage 102.00%          
Other Countries | Securities Lending and Securities Repurchase Transactions            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Guarantor Obligations, Liquidation Proceeds, Percentage 105.00%          
Minimum            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life 3 years          
Maximum            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Estimated useful life 40 years          
[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] Prior period amounts adjusted for the adoption of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.