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Supplementary Quarterly Financial Data (Unaudited) - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in Accounting Estimate [Line Items]              
Additional expense $ 8 $ (24) $ (21) $ 118 $ 81 $ 8 $ (78)
Reclassification from AOCL 1,011       1,011 882  
Retained deficit* (2,338)       $ (2,338) $ (2,535)  
Impact of Revision              
Change in Accounting Estimate [Line Items]              
Additional expense $ 0 (16) (13) (6)      
Reclassification from AOCL   35 19 6      
Retained deficit*   $ 35 $ 19 $ 6