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Significant Accounting Policies and Pronouncements (New Accounting Pronouncements) (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 9,171 $ 7,171    
Other Comprehensive Income (Loss), Net of Tax $ 1,502 (1,371) $ 409  
Accounting Standards Update 2018-12        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   7,171 8,180 $ 6,839
Other Comprehensive Income (Loss), Net of Tax   $ (1,371) $ 409