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$ 86,373 $ 12,113 $ 349 $ 17 $ 98,120 U.S. government bonds 375 60 2 - 433 State and municipal bonds 5,322 1,311 12 - 6,621 Foreign government bonds 373 64 5 - 432 RMBS 2,334 196 4 1 2,525 CMBS 1,552 61 14 - 1,599 ABS 8,439 127 54 - 8,512 Hybrid and redeemable preferred securities 409 107 11 1 504 Total fixed maturity AFS securities $ 105,177 $ 14,039 $ 451 $ 19 $ 118,746 As of December 31, 2020 Allowance Amortized Gross Unrealized for Credit Fair Cost Gains Losses Losses Value Fixed maturity AFS securities: Corporate bonds$ 86,289 $ 16,662 $ 150 $ 12 $ 102,789 U.S. government bonds 397 88 1 - 484 State and municipal bonds 5,360 1,561 - - 6,921 Foreign government bonds 384 87 1 - 470 RMBS 2,765 313 1 1 3,076 CMBS 1,390 115 - - 1,505 ABS 7,041 158 15 - 7,184 Hybrid and redeemable preferred securities 548 97 30 - 615 Total fixed maturity AFS securities $ 104,174 $ 19,081 $ 198 $ 13 $ 123,044
Available-For-Sale Securities By Contractual Maturities	Amortized Fair Cost Value Due in one year or less$ 3,016 $ 3,032 Due after one year through five years 15,243 15,896 Due after five years through ten years 18,900 20,251 Due after ten years 55,693 66,931 Subtotal 92,852 106,110 Structured securities (RMBS, CMBS, ABS) 12,325 12,636 Total fixed maturity AFS securities $ 105,177 $ 118,746
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$ 10,796 $ 234 $ 1,567 $ 115 $ 12,363 $ 349 U.S. government bonds 6 - 26 2 32 2 State and municipal bonds 522 11 24 1 546 12 Foreign government bonds 61 3 56 2 117 5 RMBS 262 3 22 1 284 4 CMBS 446 12 37 2 483 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$ 16,786 $ 313 $ 1,973 $ 138 $ 18,759 $ 451 Total number of fixed maturity AFS securities in an unrealized loss position 2,597 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$ 3,039 $ 92 $ 607 $ 58 $ 3,646 $ 150 U.S. government bonds 28 1 - - 28 1 Foreign government bonds 57 1 - - 57 1 RMBS 45 1 7 - 52 1 ABS 1,527 9 358 6 1,885 15 Hybrid and redeemable preferred securities 112 13 96 17 208 30 Total fixed maturity AFS securities$ 4,808 $ 117 $ 1,068 $ 81 $ 5,876 $ 198 Total number of fixed maturity AFS securities in an unrealized loss position 802 (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 23 7 14 Twelve months or greater 30 11 20 Total$ 118 $ 42 52 (1)We may reflect a security in more than one aging category based on various purchase dates.
Changes In Allowance For Credit Losses On 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 43 1 1 45 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 (17) - - (17)Reductions for securities charged-off (13) - - (13)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 $972 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 $ 355 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 3 Decreases attributable to: Securities sold, paid down or matured (160) Balance as of end-of-year $ 211
Fair Value Of Trading Securities	As of December 31, 2021 2020 Fixed maturity securities: Corporate bonds$ 2,734 $ 3,107 U.S. government bonds 32 - State and municipal bonds 27 28 Foreign government bonds 73 92 RMBS 95 132 CMBS 137 134 ABS 1,338 966 Hybrid and redeemable preferred securities 46 42 Total trading securities$ 4,482 $ 4,501
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$ 17,167 $ 837 $ 18,004 $ 16,245 $ 610 $ 16,855 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 (79) (17) (96) (187) (17) (204)Unamortized premium (discount) (11) 27 16 (14) 22 8 Mark-to-market gains (losses) (1) (3) - (3) (5) - (5)Total carrying value$ 17,089 $ 902 $ 17,991 $ 16,043 $ 720 $ 16,763 (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$ 187 $ 17 $ 204 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)$ 79 $ 17 $ 96 For the Year Ended December 31, 2020 Commercial Residential Total Balance as of beginning-of-year$ - $ 2 $ 2 Impact of adopting ASU 2016-13 62 26 88 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)$ 187 $ 17 $ 204 (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 $4 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 $49 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 $(2) million of credit loss benefit (expense) related to unfunded commitments for mortgage loans on real estate for the year ended December 31, 2020.
Net Investment Income	For the Years Ended December 31, 2021 2020 2019 Fixed maturity AFS securities$ 4,351 $ 4,334 $ 4,281 Trading securities 167 202 191 Equity securities 3 3 4 Mortgage loans on real estate 680 677 629 Real estate - 1 1 Policy loans 115 125 129 Invested cash - 12 40 Commercial mortgage loan prepayment and bond make-whole premiums 199 82 119 Alternative investments 679 197 22 Consent fees 10 7 8 Other investments 64 45 30 Investment income 6,268 5,685 5,454 Investment expense (153) (175) (231)Net investment income$ 6,115 $ 5,510 $ 5,223
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)$ (25)$ (14)RMBS - (1) (1)ABS - - (1)Hybrid and redeemable preferred securities (1) - - Gross credit loss benefit (expense) (11) (26) (16)Associated amortization of DAC, VOBA, DSI and DFEL - 1 1 Net credit loss benefit (expense)$ (11)$ (25)$ (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)$ 5,575 $ 5,575 $ 2,976 $ 2,976 Securities pledged under securities lending agreements (2) 241 235 116 112 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$ 8,946 $ 10,686 $ 6,222 $ 8,137 (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$ 2,599 $ 1,588 $ 751 Securities pledged under securities lending agreements 125 2 26 Securities pledged under repurchase agreements - - (150)Investments pledged for FHLBI - (450) (350)Total increase (decrease) in payables for collateral on investments$ 2,724 $ 1,140 $ 277
Schedule Of Securities Pledged By Contractual Maturity	As of December 31, 2021 Overnight and Continuous Up to 30 Days 30 - 90‎Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 239 $ - $ - $ - $ 239 Foreign government bonds 1 - - - 1 Equity securities 1 - - - 1 Total gross secured borrowings$ 241 $ - $ - $ - $ 241 As of December 31, 2020 Overnight and Continuous Up to 30 Days 30 - 90‎Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 114 $ - $ - $ - $ 114 Foreign government bonds 2 - - - 2 Total gross secured borrowings$ 116 $ - $ - $ - $ 116
Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators For Mortgage Loans	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$ 2,384 3.04 $ 136 1.74 $ - - $ 2,520 2020 1,358 3.03 144 2.06 - - 1,502 2019 2,917 2.15 188 1.42 - - 3,105 2018 2,274 2.13 172 1.59 15 1.02 2,461 2017 1,655 2.33 149 1.74 27 0.83 1,831 2016 and prior 5,554 2.41 171 1.76 27 1.08 5,752 Total$ 16,142 $ 960 $ 69 $ 17,171 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$ 1,504 2.86 $ 32 1.52 $ - - $ 1,536 2019 3,141 2.25 258 1.78 2 1.74 3,401 2018 2,382 2.16 186 1.49 15 0.71 2,583 2017 1,786 2.34 169 1.73 - - 1,955 2016 1,713 2.37 174 1.56 22 1.58 1,909 2015 and prior 4,710 2.38 133 1.95 8 1.02 4,851 Total$ 15,236 $ 952 $ 47 $ 16,235
Residential [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Quality Indicators For Mortgage Loans	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$ 86,373 $ 12,113 $ 349 $ 17 $ 98,120 U.S. government bonds 375 60 2 - 433 State and municipal bonds 5,322 1,311 12 - 6,621 Foreign government bonds 373 64 5 - 432 RMBS 2,334 196 4 1 2,525 CMBS 1,552 61 14 - 1,599 ABS 8,439 127 54 - 8,512 Hybrid and redeemable preferred securities 409 107 11 1 504 Total fixed maturity AFS securities $ 105,177 $ 14,039 $ 451 $ 19 $ 118,746 As of December 31, 2020 Allowance Amortized Gross Unrealized for Credit Fair Cost Gains Losses Losses Value Fixed maturity AFS securities: Corporate bonds$ 86,289 $ 16,662 $ 150 $ 12 $ 102,789 U.S. government bonds 397 88 1 - 484 State and municipal bonds 5,360 1,561 - - 6,921 Foreign government bonds 384 87 1 - 470 RMBS 2,765 313 1 1 3,076 CMBS 1,390 115 - - 1,505 ABS 7,041 158 15 - 7,184 Hybrid and redeemable preferred securities 548 97 30 - 615 Total fixed maturity AFS securities $ 104,174 $ 19,081 $ 198 $ 13 $ 123,044

Available-For-Sale Securities By Contractual Maturities

Amortized Fair Cost Value Due in one year or less$ 3,016 $ 3,032 Due after one year through five years 15,243 15,896 Due after five years through ten years 18,900 20,251 Due after ten years 55,693 66,931 Subtotal 92,852 106,110 Structured securities (RMBS, CMBS, ABS) 12,325 12,636 Total fixed maturity AFS securities $ 105,177 $ 118,746

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$ 10,796 $ 234 $ 1,567 $ 115 $ 12,363 $ 349 U.S. government bonds 6 - 26 2 32 2 State and municipal bonds 522 11 24 1 546 12 Foreign government bonds 61 3 56 2 117 5 RMBS 262 3 22 1 284 4 CMBS 446 12 37 2 483 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$ 16,786 $ 313 $ 1,973 $ 138 $ 18,759 $ 451 Total number of fixed maturity AFS securities in an unrealized loss position 2,597 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$ 3,039 $ 92 $ 607 $ 58 $ 3,646 $ 150 U.S. government bonds 28 1 - - 28 1 Foreign government bonds 57 1 - - 57 1 RMBS 45 1 7 - 52 1 ABS 1,527 9 358 6 1,885 15 Hybrid and redeemable preferred securities 112 13 96 17 208 30 Total fixed maturity AFS securities$ 4,808 $ 117 $ 1,068 $ 81 $ 5,876 $ 198 Total number of fixed maturity AFS securities in an unrealized loss position 802 (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 23 7 14 Twelve months or greater 30 11 20 Total$ 118 $ 42 52 (1)We may reflect a security in more than one aging category based on various purchase dates.

Changes In Allowance For Credit Losses On 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 43 1 1 45 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 (17) - - (17)Reductions for securities charged-off (13) - - (13)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 $972 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 $ 355 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 3 Decreases attributable to: Securities sold, paid down or matured (160) Balance as of end-of-year $ 211

Fair Value Of Trading Securities

As of December 31, 2021 2020 Fixed maturity securities: Corporate bonds$ 2,734 $ 3,107 U.S. government bonds 32 - State and municipal bonds 27 28 Foreign government bonds 73 92 RMBS 95 132 CMBS 137 134 ABS 1,338 966 Hybrid and redeemable preferred securities 46 42 Total trading securities$ 4,482 $ 4,501

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$ 17,167 $ 837 $ 18,004 $ 16,245 $ 610 $ 16,855 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 (79) (17) (96) (187) (17) (204)Unamortized premium (discount) (11) 27 16 (14) 22 8 Mark-to-market gains (losses) (1) (3) - (3) (5) - (5)Total carrying value$ 17,089 $ 902 $ 17,991 $ 16,043 $ 720 $ 16,763 (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$ 187 $ 17 $ 204 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)$ 79 $ 17 $ 96 For the Year Ended December 31, 2020 Commercial Residential Total Balance as of beginning-of-year$ - $ 2 $ 2 Impact of adopting ASU 2016-13 62 26 88 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)$ 187 $ 17 $ 204 (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 $4 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 $49 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$ 4,351 $ 4,334 $ 4,281 Trading securities 167 202 191 Equity securities 3 3 4 Mortgage loans on real estate 680 677 629 Real estate - 1 1 Policy loans 115 125 129 Invested cash - 12 40 Commercial mortgage loan prepayment and bond make-whole premiums 199 82 119 Alternative investments 679 197 22 Consent fees 10 7 8 Other investments 64 45 30 Investment income 6,268 5,685 5,454 Investment expense (153) (175) (231)Net investment income$ 6,115 $ 5,510 $ 5,223

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)$ (25)$ (14)RMBS - (1) (1)ABS - - (1)Hybrid and redeemable preferred securities (1) - - Gross credit loss benefit (expense) (11) (26) (16)Associated amortization of DAC, VOBA, DSI and DFEL - 1 1 Net credit loss benefit (expense)$ (11)$ (25)$ (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)$ 5,575 $ 5,575 $ 2,976 $ 2,976 Securities pledged under securities lending agreements (2) 241 235 116 112 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$ 8,946 $ 10,686 $ 6,222 $ 8,137 (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$ 2,599 $ 1,588 $ 751 Securities pledged under securities lending agreements 125 2 26 Securities pledged under repurchase agreements - - (150)Investments pledged for FHLBI - (450) (350)Total increase (decrease) in payables for collateral on investments$ 2,724 $ 1,140 $ 277

Schedule Of Securities Pledged By Contractual Maturity

As of December 31, 2021 Overnight and Continuous Up to 30 Days 30 - 90‎Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 239 $ - $ - $ - $ 239 Foreign government bonds 1 - - - 1 Equity securities 1 - - - 1 Total gross secured borrowings$ 241 $ - $ - $ - $ 241 As of December 31, 2020 Overnight and Continuous Up to 30 Days 30 - 90‎Days Greater Than 90 Days Total Securities Lending Corporate bonds$ 114 $ - $ - $ - $ 114 Foreign government bonds 2 - - - 2 Total gross secured borrowings$ 116 $ - $ - $ - $ 116

Commercial [Member]

Financing Receivable, Credit Quality Indicator [Line Items]

Credit Quality Indicators For Mortgage Loans

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$ 2,384 3.04 $ 136 1.74 $ - - $ 2,520 2020 1,358 3.03 144 2.06 - - 1,502 2019 2,917 2.15 188 1.42 - - 3,105 2018 2,274 2.13 172 1.59 15 1.02 2,461 2017 1,655 2.33 149 1.74 27 0.83 1,831 2016 and prior 5,554 2.41 171 1.76 27 1.08 5,752 Total$ 16,142 $ 960 $ 69 $ 17,171 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$ 1,504 2.86 $ 32 1.52 $ - - $ 1,536 2019 3,141 2.25 258 1.78 2 1.74 3,401 2018 2,382 2.16 186 1.49 15 0.71 2,583 2017 1,786 2.34 169 1.73 - - 1,955 2016 1,713 2.37 174 1.56 22 1.58 1,909 2015 and prior 4,710 2.38 133 1.95 8 1.02 4,851 Total$ 15,236 $ 952 $ 47 $ 16,235

Residential [Member]

Financing Receivable, Credit Quality Indicator [Line Items]

Credit Quality Indicators For Mortgage Loans

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