Schedule II (BALANCE SHEETS - Parent Company Only) (Details) - USD ($) $ in Millions		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Assets
Investments in subsidiaries and affiliates on equity basis		$ 0		$ 0
Cash		1,247	[1]	728	[2]	$ 985
Due from subsidiaries and affiliates, net		0		0
Other assets		6,531		6,235
Total assets		167,771		167,022
Liabilities
Affiliated notional cash pooling program		0	[1]	0	[2]
Accounts payable, accrued expenses, and other liabilities		10,472		9,545
Total liabilities		117,459		115,850
Stockholders' Equity Attributable to Parent [Abstract]
Common Shares		11,121		11,121
Common Shares in treasury (20,580,486 and 15,950,685 shares)		(2,618)		(1,944)
Retained earnings		31,700		27,474
Accumulated other comprehensive income		(2,448)		543
Total shareholders' equity		50,312		51,172		48,275
Total liabilities and shareholders’ equity		167,771		167,022
Parent Company Only
Assets
Investments in subsidiaries and affiliates on equity basis		43,531		41,909
Total investments		43,531		41,909
Cash		1	[1]	3	[2]	$ 1	$ 1
Due from subsidiaries and affiliates, net		7,074		9,639
Other assets		3		3
Total assets		50,609		51,554
Liabilities
Affiliated notional cash pooling program	[3]	35	[1]	0	[2]
Accounts payable, accrued expenses, and other liabilities		262		382
Total liabilities		297		382
Stockholders' Equity Attributable to Parent [Abstract]
Common Shares		11,121		11,121
Common Shares in treasury (20,580,486 and 15,950,685 shares)		(2,618)		(1,944)
Additional paid-in capital		12,557		13,978
Retained earnings		31,700		27,474
Accumulated other comprehensive income		(2,448)		543
Total shareholders' equity		50,312		51,172
Total liabilities and shareholders’ equity		$ 50,609		$ 51,554

[1] Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2018, 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. Refer to Note 1 f) for additional information. At December 31, 2017, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.

[3] (1) Chubb maintains two notional multicurrency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information.