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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]                      
Revenues $ 3,479 $ 3,438 $ 3,542 $ 3,668 $ 3,715 $ 3,701 $ 3,486 $ 3,713 $ 14,127 $ 14,615 $ 14,117
Income (loss) before income tax and noncontrolling interests                 2,232 2,902 1,730
Net income (loss)         466 36 366 420 1,064 1,288 564
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 (52) 56 (853)
Investment gains (losses) included in net income (loss) - Loews                 (31) 27 (503)
Income Taxes                 536 895 345
Interest Expense                 522 517 448
Income from continuing operations 268 [1] 162 [1] 252 [1] 382 [1] 466 56 365 420 1,064 1,307 566
Discontinued operations, net           (20) 1     (19) (2)
CNA Specialty [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 3,512 3,516 3,242
Income (loss) before income tax and noncontrolling interests                 807 1,050 732
Net income (loss)                 464 581 422
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 (5) 30 (186)
Investment gains (losses) included in net income (loss) - Loews                 (3) 18 (110)
Income Taxes                 279 353 218
Interest Expense                 1 1 1
CNA Commercial [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 4,071 4,174 4,069
Income (loss) before income tax and noncontrolling interests                 594 770 353
Net income (loss)                 343 445 233
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 14 (15) (360)
Investment gains (losses) included in net income (loss) - Loews                 10 (14) (212)
Income Taxes                 209 260 79
Interest Expense                     3
Life And Group Non-Core [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 1,334 1,357 1,035
Income (loss) before income tax and noncontrolling interests                 (385) (124) (325)
Net income (loss)                 (191) (49) (152)
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 (8) 53 (235)
Investment gains (losses) included in net income (loss) - Loews                 (4) 30 (138)
Income Taxes                 (172) (70) (156)
Interest Expense                 23 23 23
Other Insurance [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 44 161 126
Income (loss) before income tax and noncontrolling interests                 (131) (575) (209)
Net income (loss)                 (57) (322) (104)
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 (20) 18 (76)
Investment gains (losses) included in net income (loss) - Loews                 (13) 12 (45)
Income Taxes                 (68) (207) (80)
Interest Expense                 161 133 101
Total CNA Financial [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 8,961 9,208 8,472
Income (loss) before income tax and noncontrolling interests                 885 1,121 551
Net income (loss)                 559 655 399
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 (19) 86 (857)
Investment gains (losses) included in net income (loss) - Loews                 (10) 46 (505)
Income Taxes                 248 336 61
Interest Expense                 185 157 128
Diamond Offshore [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 3,334 3,361 3,653
Income (loss) before income tax and noncontrolling interests                 1,177 1,333 1,864
Net income (loss)                 451 446 643
Income Taxes                 250 413 540
Interest Expense                 73 91 50
Business segments, general information                 Diamond Offshore's business primarily consists of operating offshore drilling rigs that are chartered on a contract basis for fixed terms by companies engaged in exploration and production of hydrocarbons.    
Number of offshore drilling rigs 49               49    
Number of countries where drilling rigs are located 13               13    
HighMount [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 390 455 620
Income (loss) before income tax and noncontrolling interests                 99 136 (839)
Net income (loss)                 62 77 (537)
Income Taxes                 36 59 (302)
Interest Expense                 46 61 80
Business segments, general information                 HighMount's business consists primarily of natural gas exploration and production operations located primarily in the Permian Basin in Texas, with estimated proved reserves totaling approximately 1.1 trillion cubic feet equivalent.    
Proved Developed and Undeveloped Reserves, Net 1,100,000,000,000               1,100,000,000,000    
HighMount's total proved reserves located in Michigan and Alabama                     17.00%
Boardwalk Pipeline [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 1,144 1,129 910
Income (loss) before income tax and noncontrolling interests                 211 283 157
Net income (loss)                 77 114 67
Income Taxes                 57 73 44
Interest Expense                 173 151 132
Business segments, general information                 Boardwalk Pipeline is engaged in the interstate transportation and storage of natural gas.    
Miles of natural gas pipeline 14,200               14,200    
Loews Hotels [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 337 308 284
Income (loss) before income tax and noncontrolling interests                 17 2 (52)
Net income (loss)                 13 1 (34)
Income Taxes                 4 1 (18)
Interest Expense                 9 10 9
Business segments, general information                

Loews Hotels owns and/or operates 17 hotels, 15 of which are in the United States and two are in Canada.

   
Total number of parent hotels owned 17               17    
Number of parent hotels in the United States 15               15    
Number of parent hotels in Canada 2               2    
Corporate And Other [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 (39) 154 178
Income (loss) before income tax and noncontrolling interests                 (157) 27 49
Net income (loss)                 (98) 14 28
Investment Gains Losses Included In Revenue And Income Loss Before Income Tax And Noncontrolling Interests                 (33) (30) 4
Investment gains (losses) included in net income (loss) - Loews                 (21) (19) 2
Income Taxes                 (59) 13 20
Interest Expense                 $ 36 $ 47 $ 49
Business segments, general information                

The Corporate and other segment consists primarily of corporate investment income, including investment gains (losses) from non-insurance subsidiaries, corporate interest expense and other unallocated expenses.

   
Core Operations [Member] | CNA Specialty [Member]
                      
Segment Reporting Information [Line Items]                      
Business segments, general information                 CNA Specialty provides a broad array of professional, financial and specialty property and casualty products and services, primarily through insurance brokers and managing general underwriters.    
Core Operations [Member] | CNA Commercial [Member]
                      
Segment Reporting Information [Line Items]                      
Business segments, general information                 CNA Commercial includes property and casualty coverages sold to small businesses and middle market entities and organizations primarily through an independent agency distribution system. CNA Commercial also includes commercial insurance and risk management products sold to large corporations primarily through insurance brokers.    
Non-core Operations [Member] | Life And Group Non-Core [Member]
                      
Segment Reporting Information [Line Items]                      
Business segments, general information                 Life & Group Non-Core primarily includes the results of the life and group lines of business that are in run-off.    
Non-core Operations [Member] | Other Insurance [Member]
                      
Segment Reporting Information [Line Items]                      
Business segments, general information                 Other Insurance primarily includes certain corporate expenses, including interest on corporate debt, and the results of certain property and casualty business primarily in run-off, including CNA Re and A&EP.    
[1] Net income for the fourth quarter of 2011 was impacted by CNA unlocking assumptions related to its payout annuity contracts, resulting in a loss recognition of $104 million (after tax and noncontrolling interests), as further discussed in Note 1.