Investments (Tables)	12 Months Ended
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value	As of December 31, 2021 Allowance Amortized Gross Unrealized for Credit Fair Cost Gains Losses Losses Value Fixed maturity AFS securities: Corporate bonds$ 86,197 $ 11,569 $ 326 $ 17 $ 97,423 U.S. government bonds 348 54 2 - 400 State and municipal bonds 5,113 1,275 11 - 6,377 Foreign government bonds 365 63 5 - 423 RMBS 2,132 178 4 1 2,305 CMBS 1,542 62 14 - 1,590 ABS 8,433 127 54 - 8,506 Hybrid and redeemable preferred securities 396 103 11 1 487 Total fixed maturity AFS securities $ 104,526 $ 13,431 $ 427 $ 19 $ 117,511 As of December 31, 2020 Allowance Amortized Gross Unrealized for Credit Fair Cost Gains Losses Losses Value Fixed maturity AFS securities: Corporate bonds$ 85,625 $ 15,947 $ 136 $ 12 $ 101,424 U.S. government bonds 369 81 1 - 449 State and municipal bonds 5,145 1,517 - - 6,662 Foreign government bonds 380 86 1 - 465 RMBS 2,551 289 1 1 2,838 CMBS 1,380 115 - - 1,495 ABS 7,035 158 15 - 7,178 Hybrid and redeemable preferred securities 536 94 30 - 600 Total fixed maturity AFS securities $ 103,021 $ 18,287 $ 184 $ 13 $ 121,111
Available-For-Sale Securities By Contractual Maturities	Amortized Fair Cost Value Due in one year or less$ 2,854 $ 2,868 Due after one year through five years 15,315 15,944 Due after five years through ten years 19,344 20,660 Due after ten years 54,906 65,638 Subtotal 92,419 105,110 Structured securities (RMBS, CMBS, ABS) 12,107 12,401 Total fixed maturity AFS securities $ 104,526 $ 117,511
Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position	As of December 31, 2021 Less Than or Equal Greater Than to Twelve Months Twelve Months Total Gross Gross Gross FairUnrealizedFairUnrealizedFair Unrealized Value Losses Value Losses Value Losses (1) Fixed maturity AFS securities: Corporate bonds$ 10,611 $ 230 $ 1,386 $ 96 $ 11,997 $ 326 U.S. government bonds 6 - 26 2 32 2 State and municipal bonds 498 10 19 1 517 11 Foreign government bonds 61 3 56 2 117 5 RMBS 261 3 20 1 281 4 CMBS 440 12 33 2 473 14 ABS 4,646 49 165 5 4,811 54 Hybrid and redeemable preferred securities 47 1 76 10 123 11 Total fixed maturity AFS securities$ 16,570 $ 308 $ 1,781 $ 119 $ 18,351 $ 427 Total number of fixed maturity AFS securities in an unrealized loss position 2,577 As of December 31, 2020 Less Than or Equal Greater Than to Twelve Months Twelve Months Total Gross Gross Gross FairUnrealizedFairUnrealizedFair Unrealized Value Losses Value Losses Value Losses (1) Fixed maturity AFS securities: Corporate bonds$ 2,785 $ 85 $ 588 $ 51 $ 3,373 $ 136 U.S. government bonds 28 1 - - 28 1 Foreign government bonds 57 1 - - 57 1 RMBS 43 1 6 - 49 1 ABS 1,527 9 355 6 1,882 15 Hybrid and redeemable preferred securities 112 13 96 17 208 30 Total fixed maturity AFS securities$ 4,552 $ 110 $ 1,045 $ 74 $ 5,597 $ 184 Total number of fixed maturity AFS securities in an unrealized loss position 782 (1)As of December 31, 2021 and 2020, we recognized $8 million and $1 million of gross unrealized losses, respectively, in OCI for fixed maturity AFS securities for which an allowance for credit losses has been recorded.
Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost	As of December 31, 2021 Gross Number Fair Unrealized of Value Losses Securities (1)Less than six months$ 12 $ 3 6 Twelve months or greater 58 8 24 Total$ 70 $ 11 30 As of December 31, 2020 Gross Number Fair Unrealized of Value Losses Securities (1)Less than six months$ 63 $ 23 14 Six months or greater, but less than nine months 2 1 4 Nine months or greater, but less than twelve months 22 6 13 Twelve months or greater 30 11 20 Total$ 117 $ 41 51 (1)We may reflect a security in more than one aging category based on various purchase dates.
Changes In Allowance For Credit Losses Of AFS	For the Year Ended December 31, 2021 Corporate Bonds RMBS Other Total Balance as of beginning-of-year$ 12 $ 1 $ - $ 13 Additions for securities for which credit losses were not previously recognized 8 - 1 9 Additions from purchases of PCD debt securities (1) - - - - Additions (reductions) for securities for which credit losses were previously recognized 5 - - 5 Reductions for securities disposed (2) - - (2)Reductions for securities charged-off (6) - - (6)Balance as of end-of-year (2)$ 17 $ 1 $ 1 $ 19 For the Year Ended December 31, 2020 Corporate Bonds RMBS ABS Total Balance as of beginning-of-year$ - $ - $ - $ - Additions for securities for which credit losses were not previously recognized 40 1 1 42 Additions from purchases of PCD debt securities (1) - - - - Additions (reductions) for securities for which credit losses were previously recognized (1) - (1) (2)Reductions for securities disposed (15) - - (15)Reductions for securities charged-off (12) - - (12)Balance as of end-of-year (2)$ 12 $ 1 $ - $ 13 (1)Represents purchased credit-deteriorated (“PCD”) fixed maturity AFS securities.(2)As of December 31, 2021 and 2020, accrued interest receivable on fixed maturity AFS securities totaled $944 million and $1.0 billion, respectively, and was excluded from the estimate of credit losses.
Schedule Of Changes In Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)	For the Year Ended December 31, 2019 Balance as of beginning-of-year $ 337 Increases attributable to: Credit losses on securities for which an OTTI was not previously recognized 13 Credit losses on securities for which an OTTI was previously recognized 2 Decreases attributable to: Securities sold, paid down or matured (148) Balance as of end-of-year $ 204
Fair Value Of Trading Securities	As of December 31, 2021 2020 Fixed maturity securities: Corporate bonds$ 2,679 $ 3,049 U.S. government bonds 32 - State and municipal bonds 27 28 Foreign government bonds 73 92 RMBS 95 131 CMBS 137 134 ABS 1,338 966 Hybrid and redeemable preferred securities 46 42 Total trading securities$ 4,427 $ 4,442
Composition Of Current And Past Due Mortgage Loans On Real Estate	As of December 31, 2021 As of December 31, 2020 Commercial Residential Total Commercial Residential Total Current$ 17,068 $ 837 $ 17,905 $ 16,162 $ 610 $ 16,772 30 to 59 days past due 15 21 36 4 28 32 60 to 89 days past due - 5 5 - 8 8 90 or more days past due - 29 29 - 69 69 Allowance for credit losses (78) (17) (95) (186) (17) (203)Unamortized premium (discount) (11) 27 16 (14) 22 8 Mark-to-market gains (losses) (1) (3) - (3) (5) - (5)Total carrying value$ 16,991 $ 902 $ 17,893 $ 15,961 $ 720 $ 16,681 (1)Represents the mark-to-market on certain mortgage loans on real estate for which we have elected the fair value option. See Note 20 for additional information.
Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate	For the Years Ended December 31, 2021 2020 2019 Average aggregate carrying value for impaired mortgage loans on real estate$ 32 $ 21 $ - Interest income recognized on impaired mortgage loans on real estate - - - Interest income collected on impaired mortgage loans on real estate - - -
Amortized Cost Of Mortgage Loans On Real Estate On Nonaccrual Status	As of December 31, 2021 As of December 31, 2020 Nonaccrual Nonaccrual with no with no Allowance Allowance for Credit for Credit Losses Nonaccrual Losses Nonaccrual Commercial mortgage loans on real estate$ - $ - $ - $ - Residential mortgage loans on real estate - 30 - 71 Total$ - $ 30 $ - $ 71
Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate	For the Year Ended December 31, 2021 Commercial Residential Total Balance as of beginning-of-year$ 186 $ 17 $ 203 Additions (reductions) from provision for credit loss expense (1) (108) - (108)Additions from purchases of PCD mortgage loans on real estate - - - Balance as of end-of-year (2)$ 78 $ 17 $ 95 For the Year Ended December 31, 2020 Commercial Residential Total Balance as of beginning-of-year$ - $ 2 $ 2 Impact of adopting ASU 2016-13 61 26 87 Additions (reductions) from provision for credit loss expense (3) 125 (11) 114 Additions from purchases of PCD mortgage loans on real estate - - - Balance as of end-of-year (2)$ 186 $ 17 $ 203 (1)Due to improving economic projections, the provision for credit loss expense decreased by $108 million for the year ended December 31, 2021. We recognized $3 million of credit loss benefit (expense) related to unfunded commitments for mortgage loans on real estate for the year ended December 31, 2021.(2)Accrued interest receivable on mortgage loans on real estate totaled $48 million as of December 31, 2021 and 2020, and was excluded from the estimate of credit losses.(3)Due to changes in economic projections driven by the impact of the COVID-19 pandemic, the provision for credit loss expense increased by $114 million for the year ended December 31, 2020. We recognized $(2) million of credit loss benefit (expense) related to unfunded commitments for mortgage loans on real estate for the year ended December 31, 2020.
Net Investment Income	For the Years Ended December 31, 2021 2020 2019 Fixed maturity AFS securities$ 4,242 $ 4,241 $ 4,214 Trading securities 165 198 187 Equity securities 3 3 4 Mortgage loans on real estate 677 674 626 Real estate - 1 1 Policy loans 115 124 128 Invested cash - 13 33 Commercial mortgage loan prepayment and bond make-whole premiums 195 78 115 Alternative investments 677 218 24 Consent fees 10 5 7 Other investments 60 42 27 Investment income 6,144 5,597 5,366 Investment expense (300) (333) (404)Net investment income$ 5,844 $ 5,264 $ 4,962
Credit Loss Expense Incurred	For the Years Ended December 31, 2021 2020 2019 Credit Loss Benefit (Expense) (1) Fixed maturity AFS securities: Corporate bonds$ (10)$ (24)$ (13)RMBS - (1) (1)ABS - - (1)Hybrid and redeemable preferred securities (1) - - Gross credit loss benefit (expense) (11) (25) (15)Associated amortization of DAC, VOBA, DSI and DFEL - 1 - Net credit loss benefit (expense)$ (11)$ (24)$ (15) (1)For the years ended December 31, 2021 and 2020, we recognized credit loss benefit (expense) incurred and write-downs taken as a result of impairments through net income (loss), pursuant to ASU 2016-13. For the year ended December 31, 2019, prior to the adoption of ASU 2016-13, we recognized write-downs taken as a result of OTTI through net income (loss).
Payables For Collateral On Investments	As of December 31, 2021 As of December 31, 2020 Carrying Fair Carrying Fair Value Value Value Value Collateral payable for derivative investments (1)$ 5,565 $ 5,565 $ 2,970 $ 2,970 Securities pledged under securities lending agreements (2) 241 235 115 112 Investments pledged for Federal Home Loan Bank of Indianapolis (“FHLBI”) (3) 3,130 4,876 3,130 5,049 Total payables for collateral on investments$ 8,936 $ 10,676 $ 6,215 $ 8,131 (1)We obtain collateral based upon contractual provisions with our counterparties. These agreements take into consideration the counterparties’ credit rating as compared to ours, the fair value of the derivative investments and specified thresholds that if exceeded result in the receipt of cash that is typically invested in cash and invested cash. This also includes interest payable on collateral. See Note 5 for additional information. (2)Our pledged securities under securities lending agreements are included in fixed maturity AFS securities on our Consolidated Balance Sheets. We generally obtain collateral in an amount equal to 102% and 105% of the fair value of the domestic and foreign securities, respectively. We value collateral daily and obtain additional collateral when deemed appropriate. The cash received in our securities lending program is typically invested in cash and invested cash or fixed maturity AFS securities.(3)Our pledged investments for FHLBI are included in fixed maturity AFS securities and mortgage loans on real estate on our Consolidated Balance Sheets. The collateral requirements are generally 105% to 115% of the fair value for fixed maturity AFS securities and 155% to 175% of the fair value for mortgage loans on real estate. The cash received in these transactions is primarily invested in cash and invested cash or fixed maturity AFS securities.
Schedule Of Increase (Decrease) In Payables For Collateral On Investments	For the Years Ended December 31, 2021 2020 2019 Collateral payable for derivative investments$ 2,595 $ 1,587 $ 767 Securities pledged under securities lending agreements 126 1 26 Securities pledged under repurchase agreements - - (152)Investments pledged for FHLBI - (450) (350)Total increase (decrease) in payables for collateral on investments$ 2,721 $ 1,138 $ 291
Schedule Of Securities Pledged By Contractual Maturity	As of December 31, 2021 Overnight and Continuous Up to 30 Days 30 - 90 Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 239 $ - $ - $ - $ 239 Equity securities 1 - - - 1 Foreign government bonds 1 - - - 1 Total gross secured borrowings$ 241 $ - $ - $ - $ 241 As of December 31, 2020 Overnight and Continuous Up to 30 Days 30 - 90 Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 114 $ - $ - $ - $ 114 Foreign government bonds 1 - - - 1 Total gross secured borrowings$ 115 $ - $ - $ - $ 115
Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans By Year Of Origination	The amortized cost of commercial mortgage loans on real estate (dollars in millions) by year of origination and credit quality indicator was as follows: As of December 31, 2021 Debt- Debt- Debt- Service Service Service Less Coverage 65% Coverage Greater Coverage than 65% Ratio to 75% Ratio than 75% Ratio Total Origination Year 2021$ 2,361 3.05 $ 136 1.74 $ - - $ 2,497 2020 1,349 3.02 144 2.06 - - 1,493 2019 2,875 2.14 187 1.42 - - 3,062 2018 2,272 2.13 168 1.59 15 1.02 2,455 2017 1,648 2.33 149 1.74 27 0.83 1,824 2016 and prior 5,543 2.41 171 1.76 27 1.08 5,741 Total$ 16,048 $ 955 $ 69 $ 17,072 As of December 31, 2020 Debt- Debt- Debt- Service Service Service Less Coverage 65% Coverage Greater Coverage than 65% Ratio to 75% Ratio than 75% Ratio Total Origination Year 2020$ 1,495 2.85 $ 32 1.52 $ - - $ 1,527 2019 3,098 2.24 258 1.78 2 1.74 3,358 2018 2,379 2.16 182 1.49 15 0.71 2,576 2017 1,779 2.34 169 1.73 - - 1,948 2016 1,711 2.37 174 1.56 22 1.58 1,907 2015 and prior 4,695 2.38 133 1.95 8 1.02 4,836 Total$ 15,157 $ 948 $ 47 $ 16,152
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage Loans By Year Of Origination	. The amortized cost of residential mortgage loans on real estate (in millions) by year of origination and credit quality indicator was as follows: As of December 31, 2021 Performing Nonperforming Total Origination Year 2021$ 467 $ 2 $ 469 2020 129 2 131 2019 189 21 210 2018 104 5 109 2017 - - - 2016 and prior - - - Total$ 889 $ 30 $ 919 As of December 31, 2020 Performing Nonperforming Total Origination Year 2020$ 176 $ 8 $ 184 2019 315 51 366 2018 175 12 187 2017 - - - 2016 - - - 2015 and prior - - - Total$ 666 $ 71 $ 737

Investments (Tables)

12 Months Ended

Dec. 31, 2021

Financing Receivable, Credit Quality Indicator [Line Items]

Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value

As of December 31, 2021 Allowance Amortized Gross Unrealized for Credit Fair Cost Gains Losses Losses Value Fixed maturity AFS securities: Corporate bonds$ 86,197 $ 11,569 $ 326 $ 17 $ 97,423 U.S. government bonds 348 54 2 - 400 State and municipal bonds 5,113 1,275 11 - 6,377 Foreign government bonds 365 63 5 - 423 RMBS 2,132 178 4 1 2,305 CMBS 1,542 62 14 - 1,590 ABS 8,433 127 54 - 8,506 Hybrid and redeemable preferred securities 396 103 11 1 487 Total fixed maturity AFS securities $ 104,526 $ 13,431 $ 427 $ 19 $ 117,511 As of December 31, 2020 Allowance Amortized Gross Unrealized for Credit Fair Cost Gains Losses Losses Value Fixed maturity AFS securities: Corporate bonds$ 85,625 $ 15,947 $ 136 $ 12 $ 101,424 U.S. government bonds 369 81 1 - 449 State and municipal bonds 5,145 1,517 - - 6,662 Foreign government bonds 380 86 1 - 465 RMBS 2,551 289 1 1 2,838 CMBS 1,380 115 - - 1,495 ABS 7,035 158 15 - 7,178 Hybrid and redeemable preferred securities 536 94 30 - 600 Total fixed maturity AFS securities $ 103,021 $ 18,287 $ 184 $ 13 $ 121,111

Available-For-Sale Securities By Contractual Maturities

Amortized Fair Cost Value Due in one year or less$ 2,854 $ 2,868 Due after one year through five years 15,315 15,944 Due after five years through ten years 19,344 20,660 Due after ten years 54,906 65,638 Subtotal 92,419 105,110 Structured securities (RMBS, CMBS, ABS) 12,107 12,401 Total fixed maturity AFS securities $ 104,526 $ 117,511

Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position

As of December 31, 2021 Less Than or Equal Greater Than to Twelve Months Twelve Months Total Gross Gross Gross FairUnrealizedFairUnrealizedFair Unrealized Value Losses Value Losses Value Losses (1) Fixed maturity AFS securities: Corporate bonds$ 10,611 $ 230 $ 1,386 $ 96 $ 11,997 $ 326 U.S. government bonds 6 - 26 2 32 2 State and municipal bonds 498 10 19 1 517 11 Foreign government bonds 61 3 56 2 117 5 RMBS 261 3 20 1 281 4 CMBS 440 12 33 2 473 14 ABS 4,646 49 165 5 4,811 54 Hybrid and redeemable preferred securities 47 1 76 10 123 11 Total fixed maturity AFS securities$ 16,570 $ 308 $ 1,781 $ 119 $ 18,351 $ 427 Total number of fixed maturity AFS securities in an unrealized loss position 2,577 As of December 31, 2020 Less Than or Equal Greater Than to Twelve Months Twelve Months Total Gross Gross Gross FairUnrealizedFairUnrealizedFair Unrealized Value Losses Value Losses Value Losses (1) Fixed maturity AFS securities: Corporate bonds$ 2,785 $ 85 $ 588 $ 51 $ 3,373 $ 136 U.S. government bonds 28 1 - - 28 1 Foreign government bonds 57 1 - - 57 1 RMBS 43 1 6 - 49 1 ABS 1,527 9 355 6 1,882 15 Hybrid and redeemable preferred securities 112 13 96 17 208 30 Total fixed maturity AFS securities$ 4,552 $ 110 $ 1,045 $ 74 $ 5,597 $ 184 Total number of fixed maturity AFS securities in an unrealized loss position 782 (1)As of December 31, 2021 and 2020, we recognized $8 million and $1 million of gross unrealized losses, respectively, in OCI for fixed maturity AFS securities for which an allowance for credit losses has been recorded.

Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost

As of December 31, 2021 Gross Number Fair Unrealized of Value Losses Securities (1)Less than six months$ 12 $ 3 6 Twelve months or greater 58 8 24 Total$ 70 $ 11 30 As of December 31, 2020 Gross Number Fair Unrealized of Value Losses Securities (1)Less than six months$ 63 $ 23 14 Six months or greater, but less than nine months 2 1 4 Nine months or greater, but less than twelve months 22 6 13 Twelve months or greater 30 11 20 Total$ 117 $ 41 51 (1)We may reflect a security in more than one aging category based on various purchase dates.

Changes In Allowance For Credit Losses Of AFS

For the Year Ended December 31, 2021 Corporate Bonds RMBS Other Total Balance as of beginning-of-year$ 12 $ 1 $ - $ 13 Additions for securities for which credit losses were not previously recognized 8 - 1 9 Additions from purchases of PCD debt securities (1) - - - - Additions (reductions) for securities for which credit losses were previously recognized 5 - - 5 Reductions for securities disposed (2) - - (2)Reductions for securities charged-off (6) - - (6)Balance as of end-of-year (2)$ 17 $ 1 $ 1 $ 19 For the Year Ended December 31, 2020 Corporate Bonds RMBS ABS Total Balance as of beginning-of-year$ - $ - $ - $ - Additions for securities for which credit losses were not previously recognized 40 1 1 42 Additions from purchases of PCD debt securities (1) - - - - Additions (reductions) for securities for which credit losses were previously recognized (1) - (1) (2)Reductions for securities disposed (15) - - (15)Reductions for securities charged-off (12) - - (12)Balance as of end-of-year (2)$ 12 $ 1 $ - $ 13 (1)Represents purchased credit-deteriorated (“PCD”) fixed maturity AFS securities.(2)As of December 31, 2021 and 2020, accrued interest receivable on fixed maturity AFS securities totaled $944 million and $1.0 billion, respectively, and was excluded from the estimate of credit losses.

Schedule Of Changes In Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)

For the Year Ended December 31, 2019 Balance as of beginning-of-year $ 337 Increases attributable to: Credit losses on securities for which an OTTI was not previously recognized 13 Credit losses on securities for which an OTTI was previously recognized 2 Decreases attributable to: Securities sold, paid down or matured (148) Balance as of end-of-year $ 204

Fair Value Of Trading Securities

As of December 31, 2021 2020 Fixed maturity securities: Corporate bonds$ 2,679 $ 3,049 U.S. government bonds 32 - State and municipal bonds 27 28 Foreign government bonds 73 92 RMBS 95 131 CMBS 137 134 ABS 1,338 966 Hybrid and redeemable preferred securities 46 42 Total trading securities$ 4,427 $ 4,442

Composition Of Current And Past Due Mortgage Loans On Real Estate

As of December 31, 2021 As of December 31, 2020 Commercial Residential Total Commercial Residential Total Current$ 17,068 $ 837 $ 17,905 $ 16,162 $ 610 $ 16,772 30 to 59 days past due 15 21 36 4 28 32 60 to 89 days past due - 5 5 - 8 8 90 or more days past due - 29 29 - 69 69 Allowance for credit losses (78) (17) (95) (186) (17) (203)Unamortized premium (discount) (11) 27 16 (14) 22 8 Mark-to-market gains (losses) (1) (3) - (3) (5) - (5)Total carrying value$ 16,991 $ 902 $ 17,893 $ 15,961 $ 720 $ 16,681 (1)Represents the mark-to-market on certain mortgage loans on real estate for which we have elected the fair value option. See Note 20 for additional information.

Schedule Of Average Carrying Value Of Impaired Mortgage Loans On Real Estate

For the Years Ended December 31, 2021 2020 2019 Average aggregate carrying value for impaired mortgage loans on real estate$ 32 $ 21 $ - Interest income recognized on impaired mortgage loans on real estate - - - Interest income collected on impaired mortgage loans on real estate - - -

Amortized Cost Of Mortgage Loans On Real Estate On Nonaccrual Status

As of December 31, 2021 As of December 31, 2020 Nonaccrual Nonaccrual with no with no Allowance Allowance for Credit for Credit Losses Nonaccrual Losses Nonaccrual Commercial mortgage loans on real estate$ - $ - $ - $ - Residential mortgage loans on real estate - 30 - 71 Total$ - $ 30 $ - $ 71

Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate

For the Year Ended December 31, 2021 Commercial Residential Total Balance as of beginning-of-year$ 186 $ 17 $ 203 Additions (reductions) from provision for credit loss expense (1) (108) - (108)Additions from purchases of PCD mortgage loans on real estate - - - Balance as of end-of-year (2)$ 78 $ 17 $ 95 For the Year Ended December 31, 2020 Commercial Residential Total Balance as of beginning-of-year$ - $ 2 $ 2 Impact of adopting ASU 2016-13 61 26 87 Additions (reductions) from provision for credit loss expense (3) 125 (11) 114 Additions from purchases of PCD mortgage loans on real estate - - - Balance as of end-of-year (2)$ 186 $ 17 $ 203 (1)Due to improving economic projections, the provision for credit loss expense decreased by $108 million for the year ended December 31, 2021. We recognized $3 million of credit loss benefit (expense) related to unfunded commitments for mortgage loans on real estate for the year ended December 31, 2021.(2)Accrued interest receivable on mortgage loans on real estate totaled $48 million as of December 31, 2021 and 2020, and was excluded from the estimate of credit losses.(3)Due to changes in economic projections driven by the impact of the COVID-19 pandemic, the provision for credit loss expense increased by $114 million for the year ended December 31, 2020. We recognized $(2) million of credit loss benefit (expense) related to unfunded commitments for mortgage loans on real estate for the year ended December 31, 2020.

Net Investment Income

For the Years Ended December 31, 2021 2020 2019 Fixed maturity AFS securities$ 4,242 $ 4,241 $ 4,214 Trading securities 165 198 187 Equity securities 3 3 4 Mortgage loans on real estate 677 674 626 Real estate - 1 1 Policy loans 115 124 128 Invested cash - 13 33 Commercial mortgage loan prepayment and bond make-whole premiums 195 78 115 Alternative investments 677 218 24 Consent fees 10 5 7 Other investments 60 42 27 Investment income 6,144 5,597 5,366 Investment expense (300) (333) (404)Net investment income$ 5,844 $ 5,264 $ 4,962

Credit Loss Expense Incurred

For the Years Ended December 31, 2021 2020 2019 Credit Loss Benefit (Expense) (1) Fixed maturity AFS securities: Corporate bonds$ (10)$ (24)$ (13)RMBS - (1) (1)ABS - - (1)Hybrid and redeemable preferred securities (1) - - Gross credit loss benefit (expense) (11) (25) (15)Associated amortization of DAC, VOBA, DSI and DFEL - 1 - Net credit loss benefit (expense)$ (11)$ (24)$ (15) (1)For the years ended December 31, 2021 and 2020, we recognized credit loss benefit (expense) incurred and write-downs taken as a result of impairments through net income (loss), pursuant to ASU 2016-13. For the year ended December 31, 2019, prior to the adoption of ASU 2016-13, we recognized write-downs taken as a result of OTTI through net income (loss).

Payables For Collateral On Investments

As of December 31, 2021 As of December 31, 2020 Carrying Fair Carrying Fair Value Value Value Value Collateral payable for derivative investments (1)$ 5,565 $ 5,565 $ 2,970 $ 2,970 Securities pledged under securities lending agreements (2) 241 235 115 112 Investments pledged for Federal Home Loan Bank of Indianapolis (“FHLBI”) (3) 3,130 4,876 3,130 5,049 Total payables for collateral on investments$ 8,936 $ 10,676 $ 6,215 $ 8,131 (1)We obtain collateral based upon contractual provisions with our counterparties. These agreements take into consideration the counterparties’ credit rating as compared to ours, the fair value of the derivative investments and specified thresholds that if exceeded result in the receipt of cash that is typically invested in cash and invested cash. This also includes interest payable on collateral. See Note 5 for additional information. (2)Our pledged securities under securities lending agreements are included in fixed maturity AFS securities on our Consolidated Balance Sheets. We generally obtain collateral in an amount equal to 102% and 105% of the fair value of the domestic and foreign securities, respectively. We value collateral daily and obtain additional collateral when deemed appropriate. The cash received in our securities lending program is typically invested in cash and invested cash or fixed maturity AFS securities.(3)Our pledged investments for FHLBI are included in fixed maturity AFS securities and mortgage loans on real estate on our Consolidated Balance Sheets. The collateral requirements are generally 105% to 115% of the fair value for fixed maturity AFS securities and 155% to 175% of the fair value for mortgage loans on real estate. The cash received in these transactions is primarily invested in cash and invested cash or fixed maturity AFS securities.

Schedule Of Increase (Decrease) In Payables For Collateral On Investments

For the Years Ended December 31, 2021 2020 2019 Collateral payable for derivative investments$ 2,595 $ 1,587 $ 767 Securities pledged under securities lending agreements 126 1 26 Securities pledged under repurchase agreements - - (152)Investments pledged for FHLBI - (450) (350)Total increase (decrease) in payables for collateral on investments$ 2,721 $ 1,138 $ 291

Schedule Of Securities Pledged By Contractual Maturity

As of December 31, 2021 Overnight and Continuous Up to 30 Days 30 - 90 Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 239 $ - $ - $ - $ 239 Equity securities 1 - - - 1 Foreign government bonds 1 - - - 1 Total gross secured borrowings$ 241 $ - $ - $ - $ 241 As of December 31, 2020 Overnight and Continuous Up to 30 Days 30 - 90 Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 114 $ - $ - $ - $ 114 Foreign government bonds 1 - - - 1 Total gross secured borrowings$ 115 $ - $ - $ - $ 115

Commercial [Member]

Financing Receivable, Credit Quality Indicator [Line Items]

Mortgage Loans By Year Of Origination

The amortized cost of commercial mortgage loans on real estate (dollars in millions) by year of origination and credit quality indicator was as follows: As of December 31, 2021 Debt- Debt- Debt- Service Service Service Less Coverage 65% Coverage Greater Coverage than 65% Ratio to 75% Ratio than 75% Ratio Total Origination Year 2021$ 2,361 3.05 $ 136 1.74 $ - - $ 2,497 2020 1,349 3.02 144 2.06 - - 1,493 2019 2,875 2.14 187 1.42 - - 3,062 2018 2,272 2.13 168 1.59 15 1.02 2,455 2017 1,648 2.33 149 1.74 27 0.83 1,824 2016 and prior 5,543 2.41 171 1.76 27 1.08 5,741 Total$ 16,048 $ 955 $ 69 $ 17,072 As of December 31, 2020 Debt- Debt- Debt- Service Service Service Less Coverage 65% Coverage Greater Coverage than 65% Ratio to 75% Ratio than 75% Ratio Total Origination Year 2020$ 1,495 2.85 $ 32 1.52 $ - - $ 1,527 2019 3,098 2.24 258 1.78 2 1.74 3,358 2018 2,379 2.16 182 1.49 15 0.71 2,576 2017 1,779 2.34 169 1.73 - - 1,948 2016 1,711 2.37 174 1.56 22 1.58 1,907 2015 and prior 4,695 2.38 133 1.95 8 1.02 4,836 Total$ 15,157 $ 948 $ 47 $ 16,152

Residential [Member]

Financing Receivable, Credit Quality Indicator [Line Items]

Mortgage Loans By Year Of Origination

. The amortized cost of residential mortgage loans on real estate (in millions) by year of origination and credit quality indicator was as follows: As of December 31, 2021 Performing Nonperforming Total Origination Year 2021$ 467 $ 2 $ 469 2020 129 2 131 2019 189 21 210 2018 104 5 109 2017 - - - 2016 and prior - - - Total$ 889 $ 30 $ 919 As of December 31, 2020 Performing Nonperforming Total Origination Year 2020$ 176 $ 8 $ 184 2019 315 51 366 2018 175 12 187 2017 - - - 2016 - - - 2015 and prior - - - Total$ 666 $ 71 $ 737