Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule II. Condensed Financial Information of Registrant (Narrative)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	$ 702
Recorded liabilities related to indemnification agreements	7
Parent Company [Member]
Percentage of CNAF common stock outstanding currently held by Loews	90.00%
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	255
Recorded liabilities related to indemnification agreements
Maximum exposure SSAs	$ 2,000