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Quarterly Financial Data (Unaudited) - Summary of Restatement of Certain Line Items in the Balance Sheets (Parenthetical) (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Quarterly Financial Information [Line Items]              
Deferred income tax assets $ 1,812.0 $ 1,755.0 $ 1,583.0 $ 1,577.0 $ 1,458.0 $ 1,546.0 $ 1,595.0
Total assets $ 43,479.0 42,095.0 43,100.0 43,461.0 44,011.0 44,252.0 45,932.0
Restatement adjustment [Member]              
Quarterly Financial Information [Line Items]              
Deferred income tax assets   1,748.0 1,578.0 1,572.0 1,453.0 1,546.0 1,595.0
Total assets   $ 42,088.0 $ 43,095.0 $ 43,456.0 $ 44,006.0 44,252.0 45,932.0
Maximum [Member] | Restatement adjustment [Member]              
Quarterly Financial Information [Line Items]              
Deferred income tax assets           0.5 0.5
Total assets           $ 0.5 $ 0.5