Schedule II (BALANCE SHEETS - Parent Company Only) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Assets
Investments in subsidiaries and affiliates on equity basis
Short-term investments	1,763	2,228
Other investments	2,976	2,716
Cash	579	615	614	[1]	772
Due from subsidiaries and affiliates, net
Other assets	3,330	2,871
Total assets	94,510	92,545
Liabilities
Accounts payable, accrued expenses, and other liabilities	4,810	5,397
Bank Overdrafts		0
Short-term debt	1,901	1,401
Total liabilities	65,685	65,014
Stockholders' Equity Attributable to Parent [Abstract]
Common Shares	8,899	9,591
Common Shares in treasury	(255)	(159)
Additional paid-in capital	5,238	5,179
Retained earnings	13,791	10,033
Accumulated other comprehensive income	1,152	2,887
Total liabilities and shareholders’ equity	94,510	92,545
Parent Company Only
Assets
Investments in subsidiaries and affiliates on equity basis	28,351	27,251
Short-term investments	2	1
Other investments	30	30
Total investments	28,383	27,282
Cash	0	103	106		308
Due from subsidiaries and affiliates, net	844	204
Other assets	5	13
Total assets	29,232	27,602
Liabilities
Accounts payable, accrued expenses, and other liabilities	222	71
Bank Overdrafts	185
Short-term debt
Total liabilities	407	71
Stockholders' Equity Attributable to Parent [Abstract]
Common Shares	8,899	9,591
Common Shares in treasury	(255)	(159)
Additional paid-in capital	5,238	5,179
Retained earnings	13,791	10,033
Accumulated other comprehensive income	1,152	2,887
Total shareholders' equity	28,825	27,531
Total liabilities and shareholders’ equity	$ 29,232	$ 27,602

[1] ACE maintains two notional multi-currency cash pools (Pools) with a third-party bank. Refer to Note 1 f) for additional information. At December 31, 2012, the cash balance of one or more entities was negative; however, the overall Pool balances were positive.