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Impact of New Accounting Standard (Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) | $ 60,467 | [1] | $ 52,901 | [2] |  |  |
Equity Securities, FV-NI | 139 |  | 134 |  |  |  |
Mortgage loans (net of allowance for credit losses of $67 and $51) | 7,377 |  | 6,590 |  |  |  |
Policy loans | 1,206 |  | 1,231 |  |  |  |
Funds withheld at interest | 5,683 |  | 6,003 |  |  |  |
Real Estate Investments, Joint Ventures | 2,635 |  | 2,327 |  |  |  |
Short-term investments | 222 |  | 154 |  |  |  |
Other invested assets | 1,171 |  | 1,140 |  |  |  |
Investments | 78,900 |  | 70,480 |  |  |  |
Cash and cash equivalents | 2,970 |  | 2,927 |  | $ 2,948 |  | $ 3,408
Accrued investment income | 759 |  | 630 |  |  |  |
Premiums receivable and other reinsurance balances | 3,528 |  | 3,013 |  |  |  |
Reinsurance ceded receivables and other | 5,448 |  | 2,671 |  |  |  |
Deferred policy acquisition costs | 4,617 |  | 4,128 |  |  |  |
Other assets | 1,401 |  | 1,055 |  |  |  |
Total assets | 97,623 |  | 84,904 |  | 92,941 |  |
Future policy benefits | 41,231 |  | 35,689 |  |  |  |
Interest-sensitive contract liabilities | 30,273 |  | 30,342 |  |  |  |
Market Risk Benefit, Net Amount at Risk | 258 |  | 247 |  |  |  |
Other policy claims and benefits | 2,730 |  | 2,480 |  |  |  |
Other reinsurance balances | 1,103 |  | 725 |  |  |  |
Deferred income taxes | 1,862 |  | 1,383 |  |  |  |
Other liabilities | 2,085 |  | 1,420 |  |  |  |
Long-term debt | 4,427 |  | 3,961 |  |  |  |
Liabilities | 88,452 |  | 77,733 |  |  |  |
Preferred stock (par value $.01 per share; 10,000,000 shares authorized; no shares issued or outstanding) | 0 |  | 0 |  |  |  |
Common stock (par value $0.01 per share; 140,000,000 shares authorized; shares issued: 85,310,598 at both December 31, 2023 and December 31, 2022) | 1 |  | 1 |  |  |  |
Additional paid-in-capital | 2,544 |  | 2,502 |  |  |  |
Retained earnings | 8,805 |  | 8,169 |  |  |  |
Treasury Stock, Value | (1,900) |  | (1,720) |  |  |  |
Accumulated other comprehensive income (loss) | (369) |  | (1,871) |  | (500) | $ (909) |
Total stockholders equity | 9,081 |  | 7,081 |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest | 90 |  | 90 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 9,171 |  | 7,171 |  |  |  |
Total liabilities and stockholders’ equity | 97,623 |  | 84,904 |  |  |  |
Funds Held under Reinsurance Agreements, Liability | $ 4,483 |  | 1,486 |  |  |  |
Accounting Standards Update 2018-12 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) |  |  | 52,901 |  | 60,749 |  |
Equity Securities, FV-NI |  |  | 134 |  | 151 |  |
Mortgage loans (net of allowance for credit losses of $67 and $51) |  |  | 6,590 |  | 6,283 |  |
Policy loans |  |  | 1,231 |  | 1,234 |  |
Funds withheld at interest |  |  | 6,003 |  | 6,954 |  |
Real Estate Investments, Joint Ventures |  |  | 2,327 |  | 1,996 |  |
Short-term investments |  |  | 154 |  | 87 |  |
Other invested assets |  |  | 1,140 |  | 1,074 |  |
Investments |  |  | 70,480 |  | 78,528 |  |
Cash and cash equivalents |  |  | 2,927 |  | 2,948 |  |
Accrued investment income |  |  | 630 |  | 533 |  |
Premiums receivable and other reinsurance balances |  |  | 3,013 |  | 2,888 |  |
Reinsurance ceded receivables and other |  |  | 2,671 |  | 3,165 |  |
Deferred policy acquisition costs |  |  | 4,128 |  | 3,860 |  |
Other assets |  |  | 1,055 |  | 1,019 |  |
Total assets |  |  | 84,904 |  | 92,941 |  |
Future policy benefits |  |  | 35,689 |  | 47,449 |  |
Interest-sensitive contract liabilities |  |  | 30,342 |  | 26,119 |  |
Market Risk Benefit, Net Amount at Risk |  |  | 247 |  | 262 |  |
Other policy claims and benefits |  |  | 2,480 |  | 2,110 |  |
Other reinsurance balances |  |  | 725 |  | 557 |  |
Deferred income taxes |  |  | 1,383 |  | 1,499 |  |
Other liabilities |  |  | 1,420 |  | 1,066 |  |
Long-term debt |  |  | 3,961 |  | 3,667 |  |
Liabilities |  |  | 77,733 |  | 84,761 |  |
Preferred stock (par value $.01 per share; 10,000,000 shares authorized; no shares issued or outstanding) |  |  | 0 |  | 0 |  |
Common stock (par value $0.01 per share; 140,000,000 shares authorized; shares issued: 85,310,598 at both December 31, 2023 and December 31, 2022) |  |  | 1 |  | 1 |  |
Additional paid-in-capital |  |  | 2,502 |  | 2,461 |  |
Retained earnings |  |  | 8,169 |  | 7,871 |  |
Treasury Stock, Value |  |  | (1,720) |  | (1,653) |  |
Accumulated other comprehensive income (loss) |  |  | (1,871) |  | (500) |  |
Total stockholders equity |  |  | 7,081 |  | 8,180 | 6,839 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | 90 |  | 0 | 0 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 7,171 |  | 8,180 | 6,839 |
Total liabilities and stockholders’ equity |  |  | 84,904 |  | 92,941 |  |
Collateralized Financings |  |  |  |  | 180 |  |
Funds Held under Reinsurance Agreements, Liability |  |  | 1,486 |  | 1,852 |  |
Previously Reported | Accounting Standards Update 2018-12 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) |  |  | 52,901 |  | 60,749 |  |
Equity Securities, FV-NI |  |  | 134 |  | 151 |  |
Mortgage loans (net of allowance for credit losses of $67 and $51) |  |  | 6,590 |  | 6,283 |  |
Policy loans |  |  | 1,231 |  | 1,234 |  |
Funds withheld at interest |  |  | 6,003 |  | 6,954 |  |
Real Estate Investments, Joint Ventures |  |  | 2,327 |  | 1,996 |  |
Short-term investments |  |  | 154 |  | 87 |  |
Other invested assets |  |  | 1,140 |  | 1,074 |  |
Investments |  |  | 70,480 |  | 78,528 |  |
Cash and cash equivalents |  |  | 2,927 |  | 2,948 |  |
Accrued investment income |  |  | 630 |  | 533 |  |
Premiums receivable and other reinsurance balances |  |  | 3,013 |  | 2,888 |  |
Reinsurance ceded receivables and other |  |  | 2,462 |  | 2,580 |  |
Deferred policy acquisition costs |  |  | 3,974 |  | 3,690 |  |
Other assets |  |  | 1,220 |  | 1,008 |  |
Total assets |  |  | 84,706 |  | 92,175 |  |
Future policy benefits |  |  | 35,220 |  | 35,782 |  |
Interest-sensitive contract liabilities |  |  | 30,572 |  | 26,377 |  |
Market Risk Benefit, Net Amount at Risk |  |  | 0 |  | 0 |  |
Other policy claims and benefits |  |  | 6,571 |  | 6,993 |  |
Other reinsurance balances |  |  | 756 |  | 613 |  |
Deferred income taxes |  |  | 736 |  | 2,886 |  |
Other liabilities |  |  | 1,169 |  | 811 |  |
Long-term debt |  |  | 3,961 |  | 3,667 |  |
Liabilities |  |  | 80,471 |  | 79,161 |  |
Preferred stock (par value $.01 per share; 10,000,000 shares authorized; no shares issued or outstanding) |  |  | 0 |  | 0 |  |
Common stock (par value $0.01 per share; 140,000,000 shares authorized; shares issued: 85,310,598 at both December 31, 2023 and December 31, 2022) |  |  | 1 |  | 1 |  |
Additional paid-in-capital |  |  | 2,502 |  | 2,461 |  |
Retained earnings |  |  | 8,967 |  | 8,563 |  |
Treasury Stock, Value |  |  | (1,720) |  | (1,653) |  |
Accumulated other comprehensive income (loss) |  |  | (5,605) |  | 3,642 |  |
Total stockholders equity |  |  | 4,145 |  | 13,014 | 14,352 |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | 90 |  | 0 | 0 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 4,235 |  | 13,014 | $ 14,352 |
Total liabilities and stockholders’ equity |  |  | 84,706 |  | 92,175 |  |
Collateralized Financings |  |  |  |  | 180 |  |
Funds Held under Reinsurance Agreements, Liability |  |  | 1,486 |  | 1,852 |  |
Revision of Prior Period, Change in Accounting Principle, Adjustment | Accounting Standards Update 2018-12 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) |  |  | 0 |  | 0 |  |
Equity Securities, FV-NI |  |  | 0 |  | 0 |  |
Mortgage loans (net of allowance for credit losses of $67 and $51) |  |  | 0 |  | 0 |  |
Policy loans |  |  | 0 |  | 0 |  |
Funds withheld at interest |  |  | 0 |  | 0 |  |
Real Estate Investments, Joint Ventures |  |  | 0 |  | 0 |  |
Short-term investments |  |  | 0 |  | 0 |  |
Other invested assets |  |  | 0 |  | 0 |  |
Investments |  |  | 0 |  | 0 |  |
Cash and cash equivalents |  |  | 0 |  | 0 |  |
Accrued investment income |  |  | 0 |  | 0 |  |
Premiums receivable and other reinsurance balances |  |  | 0 |  | 0 |  |
Reinsurance ceded receivables and other |  |  | 209 |  | 585 |  |
Deferred policy acquisition costs |  |  | 154 |  | 170 |  |
Other assets |  |  | (165) |  | 11 |  |
Total assets |  |  | 198 |  | 766 |  |
Future policy benefits |  |  | 469 |  | 11,667 |  |
Interest-sensitive contract liabilities |  |  | (230) |  | (258) |  |
Market Risk Benefit, Net Amount at Risk |  |  | 247 |  | 262 |  |
Other policy claims and benefits |  |  | (4,091) |  | (4,883) |  |
Other reinsurance balances |  |  | (31) |  | (56) |  |
Deferred income taxes |  |  | 647 |  | (1,387) |  |
Other liabilities |  |  | 251 |  | 255 |  |
Long-term debt |  |  | 0 |  | 0 |  |
Liabilities |  |  | (2,738) |  | 5,600 |  |
Preferred stock (par value $.01 per share; 10,000,000 shares authorized; no shares issued or outstanding) |  |  | 0 |  | 0 |  |
Common stock (par value $0.01 per share; 140,000,000 shares authorized; shares issued: 85,310,598 at both December 31, 2023 and December 31, 2022) |  |  | 0 |  | 0 |  |
Additional paid-in-capital |  |  | 0 |  | 0 |  |
Retained earnings |  |  | (798) |  | (692) |  |
Treasury Stock, Value |  |  | 0 |  | 0 |  |
Accumulated other comprehensive income (loss) |  |  | 3,734 |  | (4,142) |  |
Total stockholders equity |  |  | 2,936 |  | (4,834) |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  | 0 |  | 0 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | 2,936 |  | (4,834) |  |
Total liabilities and stockholders’ equity |  |  | 198 |  | 766 |  |
Collateralized Financings |  |  |  |  | 0 |  |
Funds Held under Reinsurance Agreements, Liability |  |  | $ 0 |  | $ 0 |  |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2023, the fair value of such investments was $856 million
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million.

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