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Fair Value (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Level 3
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance $ 162 $ 198 $ 164 $ 206
Included in earnings 5 6 19 14
Included in other comprehensive income (1) (3) (2) (1)
Purchases 28 4 29 9
Sales (4) (24) (18) (50)
Transfers in and (out) of Level 3 32 (11) 30 (8)
Ending balance 222 170 222 170
Level 3 | Net realized investment gains (losses)
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Included in earnings   3 1 4
Level 3 | Equity in earnings of limited partnerships
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Included in earnings 5 3 18 10
Indemnity
        
Fair value transfers due to changes in available market observable inputs        
Transfers from level 1 to level 2 0 0 0 0
Transfers from level 2 to level 1 0 0 0 1
Transfers from level 2 to level 3 0 0 0 0
Transfers from level 3 to level 2 0 0 0 0
Indemnity | Nonredeemable preferred stock
        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 2 and Level 1       1
Indemnity | Level 3
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 19 22 20 23
Included in earnings 1 0 3 1
Included in other comprehensive income 0 0 0 0
Purchases 3 0 3 0
Sales 0 (1) (3) (3)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 23 21 23 21
Indemnity | Level 3 | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1 2 2 4
Included in earnings 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases 3 0 3 0
Sales 0 0 (1) (2)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 4 2 4 2
Indemnity | Level 3 | Fixed maturities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1 2 2 4
Included in earnings 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases 3 0 3 0
Sales 0 0 (1) (2)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 4 2 4 2
Indemnity | Level 3 | Corporate debt securities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1 1 1 1
Included in earnings 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 1 1 1 1
Indemnity | Level 3 | Commercial mortgage-backed securities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 0   0  
Included in earnings 0   0  
Included in other comprehensive income 0   0  
Purchases 3   3  
Sales 0   0  
Transfers in and (out) of Level 3 0   0  
Ending balance 3   3  
Indemnity | Level 3 | Collateralized debt obligations | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 0 1 1 3
Included in earnings 0 0 0 0
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 (1) (2)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 0 1 0 1
Indemnity | Level 3 | Real estate | Limited partnerships
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 18 20 18 19
Included in earnings 1 0 3 1
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 (1) (2) (1)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 19 19 19 19
Exchange
        
Fair value transfers due to changes in available market observable inputs        
Transfers from level 1 to level 2 0 0 14 6
Transfers from level 2 to level 1 25 0 25 51
Transfers from level 2 to level 3 43 0 43 39
Transfers from level 3 to level 2 11 11 13 47
Exchange | Fixed maturities
        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 2 and Level 3 7   7 7
No. of securities transferred between Level 3 and Level 2 1 2 2 6
Exchange | Nonredeemable preferred stock
        
Fair value transfers due to changes in available market observable inputs        
No. of securities transferred between Level 1 and Level 2     2 1
No. of securities transferred between Level 2 and Level 1 3   3 5
No. of securities transferred between Level 2 and Level 3 1   1 1
Exchange | Level 3
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 143 176 144 183
Included in earnings 4 6 16 13
Included in other comprehensive income (1) (3) (2) (1)
Purchases 25 4 26 9
Sales (4) (23) (15) (47)
Transfers in and (out) of Level 3 32 (11) 30 (8)
Ending balance 199 149 199 149
Exchange | Level 3 | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 26 56 31 59
Included in earnings 0 0 1 4
Included in other comprehensive income (1) (3) (2) (1)
Purchases 25 0 26 5
Sales (1) (7) (5) (24)
Transfers in and (out) of Level 3 32 (11) 30 (8)
Ending balance 81 35 81 35
Exchange | Level 3 | Trading securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 15 7 15 15
Included in earnings 0 3 0 0
Included in other comprehensive income 0 0 0 0
Purchases 0 4 0 4
Sales 0 0 0 (5)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 15 14 15 14
Exchange | Level 3 | Fixed maturities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 25 49 31 59
Included in earnings 0 0 1 2
Included in other comprehensive income (1) 0 (2) 0
Purchases 25 0 25 1
Sales (1) (3) (5) (14)
Transfers in and (out) of Level 3 25 (11) 23 (13)
Ending balance 73 35 73 35
Exchange | Level 3 | Corporate debt securities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 25 33 26 43
Included in earnings 0 0 0 0
Included in other comprehensive income (1) 0 (1) 0
Purchases 25 0 25 1
Sales (1) 0 (2) (3)
Transfers in and (out) of Level 3 23 (7) 23 (15)
Ending balance 71 26 71 26
Exchange | Level 3 | Commercial mortgage-backed securities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance   4   0
Included in earnings   0   0
Included in other comprehensive income   0   0
Purchases   0   0
Sales   0   (1)
Transfers in and (out) of Level 3   (4)   1
Ending balance   0   0
Exchange | Level 3 | Collateralized debt obligations | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 0 12 5 16
Included in earnings 0 0 1 2
Included in other comprehensive income 0 0 (1) 0
Purchases 0 0 0 0
Sales 0 (3) (3) (10)
Transfers in and (out) of Level 3 0 0 (2) 1
Ending balance 0 9 0 9
Exchange | Level 3 | Other debt securities | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 0   0  
Included in earnings 0   0  
Included in other comprehensive income 0   0  
Purchases 0   0  
Sales 0   0  
Transfers in and (out) of Level 3 2   2  
Ending balance 2   2  
Exchange | Level 3 | Nonredeemable preferred stock | Available-for-sale securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 1 7 0 0
Included in earnings 0 0 0 2
Included in other comprehensive income 0 (3) 0 (1)
Purchases 0 0 1 4
Sales 0 (4) 0 (10)
Transfers in and (out) of Level 3 7 0 7 5
Ending balance 8 0 8 0
Exchange | Level 3 | Common stock | Trading securities
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 15 7 15 15
Included in earnings 0 3 0 0
Included in other comprehensive income 0 0 0 0
Purchases 0 4 0 4
Sales 0 0 0 (5)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 15 14 15 14
Exchange | Level 3 | Real estate | Limited partnerships
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Beginning balance 102 113 98 109
Included in earnings 4 3 15 9
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales (3) (16) (10) (18)
Transfers in and (out) of Level 3 0 0 0 0
Ending balance 103 100 103 100
Fair value measurements on a recurring basis
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Ending balance 222   222  
Fair value measurements on a recurring basis | Indemnity
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Ending balance 23   23  
Fair value measurements on a recurring basis | Indemnity | Real estate
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Ending balance 19   19  
Fair value measurements on a recurring basis | Exchange
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Ending balance 199   199  
Fair value measurements on a recurring basis | Exchange | Real estate
        
Roll forward of consolidated level 3 fair value measurements on a recurring basis        
Ending balance $ 103   $ 103