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Acquisitions and Dispositions - Amortization expense (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Jan. 04, 2021
Business Acquisition [Line Items]    
2022 $ 342  
2023 291  
2024 226  
2025 179  
2026 92  
Thereafter $ 151  
National General Holdings Corp.    
Business Acquisition [Line Items]    
2022   $ 218
2023   185
2024   135
2025   103
2026   70
Thereafter   140
Total amortization   $ 851