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Restructuring and Related Activities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other costs | $ 1 | $ 104 | $ 0
Hartford Next Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Payments for Restructuring | (37) | (50) |
Hartford Next Program | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Payments for Restructuring | (11) | (19) |
Hartford Next Program | Information Technology |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Payments for Restructuring | (9) | (2) |
Hartford Next Program | Professional fees and other expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Payments for Restructuring | (17) | (29) |
Hartford Next Program | Other liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 18 | 54 | 0
Hartford Next Program | Other liabilities | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 18 | 54 | 0
Restructuring Reserve, Period Increase (Decrease) | 25 |  |
Hartford Next Program | Other liabilities | Information Technology |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 0 | 0 | 0
Hartford Next Program | Other liabilities | Professional fees and other expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 0 | 0 | $ 0
Other Operating Income (Expense) [Member] | Hartford Next Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 130 |  |
Restructuring and other costs | 1 | 104 |
Other Operating Income (Expense) [Member] | Hartford Next Program | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 48 |  |
Restructuring and other costs | 25 | 73 |
Other Operating Income (Expense) [Member] | Hartford Next Program | Information Technology |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 21 |  |
Restructuring and other costs | 9 | 2 |
Other Operating Income (Expense) [Member] | Hartford Next Program | Professional fees and other expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Related Cost, Expected Cost | 61 |  |
Restructuring and other costs | $ 17 | $ 29 |

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