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Benefit Plans (Narrative) (details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Future capital call commitments for limited partnership investments $ 381    
Share-based compensation arrangement by share-based payment award, number of shares authorized 6    
Share-based compensation arrangement by share-based payment award, number of shares available for grant 1.5    
Allocated share-based compensation expense 10 9 6
Employee service share-based compensation, tax benefit from compensation expense 3 3 2
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized 14    
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition 1 year 8 months 15 days    
Pension Plans, Defined Benefit [Member]
     
Defined benefit plan, accumulated benefit obligation 2,889 3,187  
Future capital call commitments for limited partnership investments 102    
Limited partnership equity related hedge fund strategy plan assets 58.00%    
Limited partnership hedge fund multi strategy plan assets 37.00%    
Limited partnership hedge fund strategy distressed investments plan assets 5.00%    
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 56    
Cost of Living Adjustment [Member]
     
Assumptions used in calculating assumed health care cost trend rate 4.00%    
Employer Subsidy on Health Care Costs [Member]
     
Assumptions used in calculating assumed health care cost trend rate 4.00%    
Other Postretirement Benefit Plan, Defined Benefit [Member]
     
Defined benefit plan, health care cost trend rate assumed for next fiscal year 4.00% 4.00% 4.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 5    
First Year of Employment [Member]
     
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 35.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 6.00%    
Defined Contribution Pension [Member]
     
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 20.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 70.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 6.00%    
Defined Contribution Plan, Employers Matching Contribution, Vesting Period in Years 5    
Liability of the CNA Savings Plan included in Separate account liabilities on the Consolidated Balance Sheets 129 256  
Company Contribution of Eligible Compensation, Depending on Age, Percent 3% or 5%    
Benefit expense for the Company's savings plan $ 71 $ 70 $ 60
Additional Contribution, Management Discretion [Member]
     
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 80.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 6.00%    
Defined Contribution Plan, Employers Matching Contribution, Vesting Period in Years 5    
Defined Contribution Plan, Employer Discretionary Contribution Amount, Percent 2.00%    
Stock Options and SARs [Member]
     
Vesting Period Following Date of Grant, in Years 4    
Stock Options and SARs, Maximum Term Following Date of Grant, in Years 10    
Restricted Shares [Member]
     
Vesting Period Following Date of Grant, in Years 4    
Restricted Stock Units (RSUs) [Member]
     
Vesting Period Following Date of Grant, in Years 4    
Range of Shares Initially Granted Payable Based Upon Attainment of Specific Annual Performance Goals 0% to 100%    
Performance Shares [Member]
     
Range of Shares Initially Granted Payable Based Upon Attainment of Specific Annual Performance Goals 0% to 200%    
Measurement Period of Specific Annual Performance Goals, in Years 3