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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items]                  
Goodwill   $ 1,964,000,000 $ 1,964,000,000   $ 1,964,000,000 $ 1,964,000,000 $ 12,657,000,000    
Indefinite-lived intangible assets   9,000,000 9,000,000   9,000,000 9,000,000      
Finite-lived intangible assets, net   4,797,000,000     4,797,000,000        
Total other intangible assets, net   4,806,000,000 5,470,000,000   4,806,000,000 5,470,000,000      
Goodwill impairment $ 1,900,000,000 0   $ 8,800,000,000 0 10,693,000,000 $ 3,271,000,000    
Customer Relationships                  
Finite-Lived Intangible Assets [Line Items]                  
Finite-lived intangible assets, net   3,196,000,000 3,811,000,000   3,196,000,000 3,811,000,000      
Accumulated amortization   4,504,000,000 4,248,000,000   4,504,000,000 4,248,000,000      
Loss on sale of intangible assets     73,000,000     121,000,000      
Capitalized Software                  
Finite-Lived Intangible Assets [Line Items]                  
Finite-lived intangible assets, net   1,529,000,000 1,564,000,000   1,529,000,000 1,564,000,000      
Accumulated amortization   4,067,000,000 4,045,000,000   4,067,000,000 4,045,000,000      
Patents and Other                  
Finite-Lived Intangible Assets [Line Items]                  
Finite-lived intangible assets, net   72,000,000 86,000,000   72,000,000 86,000,000      
Accumulated amortization   $ 86,000,000 $ 72,000,000   $ 86,000,000 $ 72,000,000      
Fully Amortized and Retired Capitalized Software                  
Finite-Lived Intangible Assets [Line Items]                  
Intangible assets, gross carrying value               $ 352,000,000 $ 183,000,000
Fully Amortized and Retired Trade Names                  
Finite-Lived Intangible Assets [Line Items]                  
Intangible assets, gross carrying value               $ 153,000,000 $ 130,000,000