Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019
Cash flows from operating activities
Net income	$ 1,115		$ 3,281
Adjustments to reconcile net income to net cash flows from operating activities
Net realized (gains) losses	1,069		475
Amortization of premiums/discounts on fixed maturities	280		294
Amortization of purchased intangibles	217		229
Deferred income taxes	(287)		(178)
Unpaid losses and loss expenses	5,112		277
Unearned premiums	881		1,061
Future policy benefits	138		148
Insurance and reinsurance balances payable	280		(114)
Accounts payable, accrued expenses, and other liabilities	190		(6)
Income taxes payable	(95)		83
Insurance and reinsurance balances receivable	(324)		(371)
Reinsurance recoverable	(496)		426
Deferred policy acquisition costs	(77)		(266)
Other	(762)		(426)
Net cash flows from operating activities	7,241		4,913
Cash flows from investing activities
Purchases of fixed maturities available for sale	(20,793)		(19,778)
Purchases of fixed maturities held to maturity	(42)		(143)
Purchases of equity securities	(3,622)		(466)
Sales of fixed maturities available for sale	9,537		10,430
Sales of to be announced mortgage-backed securities	0		6
Sales of equity securities	1,526		577
Maturities and redemptions of fixed maturities available for sale	8,709		6,390
Maturities and redemptions of fixed maturities held to maturity	841		814
Net change in short-term investments	(434)		202
Net derivative instruments settlements	(74)		(647)
Private equity contribution	(1,056)		(1,093)
Private equity distribution	588		973
Payments to Acquire Other Investments			(329)
Payments for Other Deposits	503
Portion one of payments to acquire 22.4% of Huatai Group	(1,054)
Other	(352)		(497)
Net cash flows used for investing activities	(6,729)		(3,561)
Cash flows from financing activities
Dividends paid on Common Shares	(1,035)		(1,014)
Common Shares repurchased	(333)		(1,203)
Proceeds from issuance of repurchase agreements	1,402		2,394
Repayment of repurchase agreements	(1,402)		(2,396)
Proceeds from share-based compensation plans	77		155
Policyholder contract deposits	322		376
Policyholder contract withdrawals	(253)		(221)
Net cash flows used for financing activities	(234)		(1,124)
Proceeds from Issuance of Long-term Debt	988		1,286
Repayments of Long-term Debt	0		(501)
Effect of foreign currency rate changes on cash and restricted cash	(51)		21
Net increase (decrease) in cash and restricted cash	227		249
Cash and restricted cash - beginning of period	1,646	[1]	1,340	[2]
Cash and restricted cash - end of period	1,873	[1]	1,589	[2]
Supplemental cash flow information
Taxes paid	668		733
Interest paid	323		327
CHINA | Huatai Group [Member]
Cash flows from investing activities
Payments to Acquire Other Investments			(329)
Payments for Other Deposits	503		$ 0
Portion one of payments to acquire 22.4% of Huatai Group	$ (1,054)

[1] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At September 30, 2020 and December 31, 2019, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[2] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Various Chubb entities participate in one or the other of the Pools, pursuant to which credit and debit balances in individual Chubb accounts are translated daily into a single currency and pooled on a notional basis. Individual Chubb entities are permitted to overdraw on their individual accounts provided the overall Pool balances do not fall below zero. At September 30, 2019 and December 31, 2018, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.