Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income (loss)	$ 4,565	$ (79)
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	(854)	928
Amortization of premiums/discounts on fixed maturities	147	192
Amortization of purchased intangibles	145	145
Deferred income taxes	(28)	(302)
Unpaid losses and loss expenses	2,165	3,172
Unearned premiums	1,533	538
Future policy benefits	110	87
Insurance and reinsurance balances payable	796	118
Accounts payable, accrued expenses, and other liabilities	(630)	(304)
Income taxes payable	50	2
Insurance and reinsurance balances receivable	(1,180)	(645)
Reinsurance recoverable	(47)	(71)
Deferred policy acquisition costs	(198)	(62)
Other	(1,347)	(22)
Net cash flows from operating activities	5,227	3,697
Cash flows from investing activities
Purchases of fixed maturities available for sale	(15,217)	(13,058)
Purchases of fixed maturities held to maturity	(211)	(42)
Purchases of equity securities	(642)	(2,824)
Sales of fixed maturities available for sale	3,469	7,734
Sales of equity securities	614	1,353
Maturities and redemptions of fixed maturities available for sale	9,410	5,220
Maturities and redemptions of fixed maturities held to maturity	1,163	642
Net change in short-term investments	(120)	173
Net derivative instruments settlements	(87)	(18)
Private equity contribution	(873)	(546)
Private equity distribution	640	443
Payment, including deposit, for Huatai Group Interest	(65)	(1,550)
Other	(106)	(221)
Net cash flows used for investing activities	(2,025)	(2,694)
Cash flows from financing activities
Dividends paid on Common Shares	(703)	(678)
Common Shares repurchased	(2,440)	(333)
Proceeds from issuance of repurchase agreements	550	1,402
Repayment of repurchase agreements	(550)	(1,402)
Proceeds from share-based compensation plans	178	74
Policyholder contract deposits and other	268	215
Policyholder contract withdrawals and other	(245)	(173)
Proceeds from (Payments for) Other Financing Activities	(80)	(3)
Net cash flows used for financing activities	(3,022)	(898)
Effect of foreign currency rate changes on cash and restricted cash	(18)	(42)
Net increase (decrease) in cash and restricted cash	162	63
Cash and restricted cash - beginning of period	1,836	1,646
Cash and restricted cash - end of period	1,998	1,709
Supplemental cash flow information
Taxes paid	631	442
Interest paid	$ 271	$ 286