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Investments and Cash - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Investments    
Percent of Total [1] 100.00% 100.00%
Amortized Cost $ 10,582 $ 10,671
Gross Unrealized Gains 525 430
Gross Unrealized Losses (60) (78)
Estimated Fair Value 11,047 11,023
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (32) [2] $ (21)
Fixed Maturities [Member]    
Investments    
Percent of Total [1] 96.00% 96.00%
Amortized Cost $ 10,123 $ 10,275
Gross Unrealized Gains 525 430
Gross Unrealized Losses (60) (78)
Estimated Fair Value 10,588 10,627
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (32) [2] $ (21)
Short-term Investments [Member]    
Investments    
Percent of Total [1] 4.00% 4.00%
Amortized Cost $ 459 $ 396
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 459 396
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 [2] $ 0
Obligations of state and political subdivisions [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1] 51.00% 52.00%
Amortized Cost $ 5,417 $ 5,528
Gross Unrealized Gains 360 323
Gross Unrealized Losses (1) (10)
Estimated Fair Value 5,776 5,841
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 3 [2] $ 5
US government and agencies [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1] 4.00% 3.00%
Amortized Cost $ 379 $ 377
Gross Unrealized Gains 26 23
Gross Unrealized Losses 0 0
Estimated Fair Value 405 400
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 [2] $ 0
Corporate securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1] 14.00% 14.00%
Amortized Cost $ 1,473 $ 1,505
Gross Unrealized Gains 69 38
Gross Unrealized Losses (17) (23)
Estimated Fair Value 1,525 1,520
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (11) [2] $ (13)
RMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1],[3] 11.00% 11.00%
Amortized Cost [3] $ 1,222 $ 1,238
Gross Unrealized Gains [3] 37 29
Gross Unrealized Losses [3] (20) (22)
Estimated Fair Value [3] 1,239 1,245
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment [3] $ (13) [2] $ (7)
CMBS [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1],[3] 5.00% 5.00%
Amortized Cost [3] $ 531 $ 506
Gross Unrealized Gains [3] 25 9
Gross Unrealized Losses [3] 0 (2)
Estimated Fair Value [3] 556 513
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment [3] $ 0 [2] $ 0
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1] 8.00% 8.00%
Amortized Cost $ 821 $ 831
Gross Unrealized Gains 3 4
Gross Unrealized Losses (13) (10)
Estimated Fair Value 811 825
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ (11) [2] $ (6)
Foreign government securities [Member] | Fixed Maturities [Member]    
Investments    
Percent of Total [1] 3.00% 3.00%
Amortized Cost $ 280 $ 290
Gross Unrealized Gains 5 4
Gross Unrealized Losses (9) (11)
Estimated Fair Value 276 283
AOCI Gain (Loss) on Securities with Other-Than-Temporary Impairment $ 0 [2] $ 0
[1] Based on amortized cost.
[2] Accumulated OCI. See also Note 17, Shareholders' Equity.
[3] Government-agency obligations were approximately 52% of mortgage backed securities as of March 31, 2016 and 54% as of December 31, 2015 based on fair value.