Debt	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Senior Notes On March 15, 2018, The Hartford issued $500 of 4.4% senior notes ("4.4% Notes") due March 15, 2048 for net proceeds of approximately $490, after deducting underwriting discounts and expenses from the offering. Interest is payable semi-annually in arrears on March 15 and September 15, commencing September 15, 2018. The Hartford, at its option, can redeem the 4.4% Notes at any time, in whole or in part, at a redemption price equal to the greater of 100% of the principal amount being redeemed or a make-whole amount based on a comparable maturity US Treasury plus 25 basis points, plus any accrued and unpaid interest, except the option of a make-whole payment is not applicable within the final six months before maturity. On March 15, 2018, The Hartford repaid at maturity the $320 principal amount of its 6.3% senior notes. Junior Subordinated Debentures On June 15, 2018, The Hartford redeemed $500 aggregate principal amount of its 8.125% Fixed-to-Floating Rate Junior Subordinated Debentures due 2068. During the initial offering of the 8.125% debentures, the Company entered into a replacement capital covenant ("RCC"), and under the terms of the RCC, if the Company redeemed the 8.125% debentures at any time prior to June 15, 2048 it could only do so with the proceeds from the sale of certain qualifying replacement securities. The 3 month Libor plus 2.125% debentures issued February 15, 2017 are qualifying replacement securities within the definition of RCC. In connection with this redemption, the Company recognized a $6 loss on extinguishment of debt for unamortized deferred debt issuance costs. Revolving Credit Facility On March 29, 2018, the Company entered into an amendment to its Five-Year Credit Agreement dated October 31, 2014. The Amendment reset the level of the Company's minimum consolidated net worth financial covenant to $9 billion excluding AOCI from its former $13.5 billion (where net worth was defined as stockholders' equity excluding AOCI and including junior subordinated debt), among other updates. Among other changes, under an amended and restated credit agreement that became effective in June 2018 after the closing of the sale of the Company's life and annuity run-off business, the aggregate amount of principal of the credit facility decreased from $1 billion to $750, including a reduction to the amount available for letters of credit from $250 to $100, the maturity date was extended to March 29, 2023, and the liens covenant and certain other covenants were modified. Revolving loans from the Credit Facility may be in multiple currencies. U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate depending on the type of borrowing and a basis point spread based on The Hartford's credit rating and will mature no later than March 29, 2023. Letters of credit issued from the Credit Facility bear a fee based on The Hartford's credit rating and expire no later than March 29, 2024. The Credit Facility requires the Company to maintain a minimum consolidated net worth excluding AOCI of $9 billion, limit the ratio of senior debt to capitalization, excluding AOCI, at 35% and meet other customary covenants. The Credit Facility is for general corporate purposes. As of September 30, 2018, no borrowings were outstanding and $3 in letters of credit were issued under the Credit Facility and the Company was in compliance with all financial covenants. Commercial Paper As of September 30, 2018, the Hartford's maximum borrowings available under its commercial paper program was $750 and there was no commercial paper outstanding. The Company is dependent upon market conditions to access short-term financing through the issuance of commercial paper to investors. On July 19, 2018, the Board of Directors revised the Company's commercial paper issuance authorization from $1 billion to $750 to align the program with the Company's $750 five year revolving credit facility which became effective on June 11, 2018. Collateralized Advances with Federal Home Loan Bank of Boston In August 2018, the Company’s subsidiaries, Hartford Fire Insurance Company (“Hartford Fire”) and Hartford Life and Accident Insurance Company (“HLA”), became members of the Federal Home Loan Bank of Boston (“FHLBB”). Membership allows these subsidiaries access to collateralized advances, which may be short- or long-term with fixed or variable rates. FHLBB membership required the purchase of member stock and requires additional member stock ownership of 3% or 4% of any amount borrowed. Acceptable forms of collateral include real estate backed fixed maturities and mortgage loans and the amount of advances that can be taken is limited to a percentage of the fair value of the assets that ranges from a high of 97% for US government-backed fixed maturities maturing within 3 years to a low of 40% for A-rated commercial mortgage-backed fixed maturities maturing in 5 years or more. In its consolidated balance sheets, The Hartford would present the liability for advances taken based on use of the funds with advances for general corporate purposes presented in short- or long-term debt and advances to earn incremental investment income presented in other liabilities, consistent with other collateralized financing transactions such as securities lending and repurchase agreements. The Connecticut Department of Insurance (“CTDOI”) permits Hartford Fire and HLA to pledge up to $1.3 billion and $0.5 billion in qualifying assets, respectively, without prior approval, to secure FHLBB advances in 2018. The pledge limit is determined annually based on statutory admitted assets and capital and surplus of Hartford Fire and HLA, respectively. As of September 30, 2018, there were no advances outstanding under the FHLBB facility.

Senior Notes

On March 15, 2018, The Hartford issued $500 of 4.4% senior notes ("4.4% Notes") due March 15, 2048 for net proceeds of approximately $490, after deducting underwriting discounts and expenses from the offering. Interest is payable semi-annually in arrears on March 15 and September 15, commencing September 15, 2018. The Hartford, at its option, can redeem the 4.4% Notes at any time, in whole or in part, at a redemption price equal to the greater of 100% of the principal amount being redeemed or a make-whole amount based on a comparable maturity US Treasury plus 25 basis points, plus any accrued and unpaid interest, except the option of a make-whole payment is not applicable within the final six months before maturity.

On March 15, 2018, The Hartford repaid at maturity the $320 principal amount of its 6.3% senior notes.

Junior Subordinated Debentures

On June 15, 2018, The Hartford redeemed $500 aggregate principal amount of its 8.125% Fixed-to-Floating Rate Junior Subordinated Debentures due 2068. During the initial offering of the 8.125% debentures, the Company entered into a replacement capital covenant ("RCC"), and under the terms of the RCC, if the Company redeemed the 8.125% debentures at any time prior to June 15, 2048 it could only do so with the proceeds from the sale of certain qualifying replacement securities. The 3 month Libor plus 2.125% debentures issued February 15, 2017 are qualifying replacement securities within the definition of RCC. In connection with this redemption, the Company recognized a $6 loss on extinguishment of debt for unamortized deferred debt issuance costs.

Revolving Credit Facility

On March 29, 2018, the Company entered into an amendment to its Five-Year Credit Agreement dated October 31, 2014. The Amendment reset the level of the Company's minimum consolidated net worth financial covenant to $9 billion excluding AOCI from its former $13.5 billion (where net worth was defined as stockholders' equity excluding AOCI and including junior subordinated debt), among other updates. Among other changes, under an amended and restated credit agreement that became effective in June 2018 after the closing of the sale of the Company's life and annuity run-off business, the aggregate amount of principal of the credit facility decreased from $1 billion to $750, including a reduction to the amount available for letters of credit from $250 to $100, the maturity date was extended to March 29, 2023, and the liens covenant and certain other covenants were modified.

Revolving loans from the Credit Facility may be in multiple currencies. U.S. dollar loans will bear interest at a floating rate equivalent to an indexed rate depending on the type of borrowing and a basis point spread based on The Hartford's credit rating and will mature no later than March 29, 2023. Letters of credit issued from the Credit Facility bear a fee based on The Hartford's credit rating and expire no later than March 29, 2024. The Credit Facility requires the Company to maintain a minimum consolidated net worth excluding AOCI of $9 billion, limit the ratio of senior debt to capitalization, excluding AOCI, at 35% and meet other customary covenants. The Credit Facility is for general corporate purposes.

As of September 30, 2018, no borrowings were outstanding and $3 in letters of credit were issued under the Credit Facility and the Company was in compliance with all financial covenants.

Commercial Paper

As of September 30, 2018, the Hartford's maximum borrowings available under its commercial paper program was $750 and there was no commercial paper outstanding. The Company is dependent upon market conditions to access short-term financing through the issuance of commercial paper to investors. On July 19, 2018, the Board of Directors revised the Company's commercial paper issuance authorization from $1 billion to $750 to align the program with the Company's $750 five year revolving credit facility which became effective on June 11, 2018.

Collateralized Advances with Federal Home Loan Bank of Boston

In August 2018, the Company’s subsidiaries, Hartford Fire Insurance Company (“Hartford Fire”) and Hartford Life and Accident Insurance Company (“HLA”), became members of the Federal Home Loan Bank of Boston (“FHLBB”). Membership allows these subsidiaries access to collateralized advances, which may be short- or long-term with fixed or variable rates. FHLBB membership required the purchase of member stock and requires additional member stock ownership of 3% or 4% of any amount borrowed. Acceptable forms of collateral include real estate backed fixed maturities and mortgage loans and the amount of advances that can be taken is limited to a percentage of the fair value of the assets that ranges from a high of 97% for US government-backed fixed maturities maturing within 3 years to a low of 40% for A-rated commercial mortgage-backed fixed maturities maturing in 5 years or more. In its consolidated balance sheets, The Hartford would present the liability for advances taken based on use of the funds with advances for general corporate purposes presented in short- or long-term debt and advances to earn incremental investment income presented in other liabilities, consistent with other collateralized financing transactions such as securities lending and repurchase agreements. The Connecticut Department of Insurance (“CTDOI”) permits Hartford Fire and HLA to pledge up to $1.3 billion and $0.5 billion in qualifying assets, respectively, without prior approval, to secure FHLBB advances in 2018. The pledge limit is determined annually based on statutory admitted assets and capital and surplus of Hartford Fire and HLA, respectively. As of September 30, 2018, there were no advances outstanding under the FHLBB facility.