Schedule I Summary of Investments - Other than Investments in Related Parties (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Summary of Investments Other than Investments in Related Parties
Cost	$ 345,104
Fair Value	358,005
Amount at which shown in the Balance Sheet	358,093
Fixed maturity securities
Summary of Investments Other than Investments in Related Parties
Cost	271,154
Fair Value	280,897
Amount at which shown in the Balance Sheet	280,897
U.S. government and government sponsored entities
Summary of Investments Other than Investments in Related Parties
Cost	8,807
Fair Value	8,918
Amount at which shown in the Balance Sheet	8,918
Obligations of states, municipalities and political subdivisions
Summary of Investments Other than Investments in Related Parties
Cost	28,825
Fair Value	29,501
Amount at which shown in the Balance Sheet	29,501
Non-U.S. government
Summary of Investments Other than Investments in Related Parties
Cost	22,047
Fair Value	22,511
Amount at which shown in the Balance Sheet	22,511
Public utilities
Summary of Investments Other than Investments in Related Parties
Cost	21,714
Fair Value	22,630
Amount at which shown in the Balance Sheet	22,630
All other corporate and debt securities
Summary of Investments Other than Investments in Related Parties
Cost	118,916
Fair Value	123,091
Amount at which shown in the Balance Sheet	123,091
Mortgage-backed, asset-backed and collateralized
Summary of Investments Other than Investments in Related Parties
Cost	70,845
Fair Value	74,246
Amount at which shown in the Balance Sheet	74,246
Equity securities and mutual funds
Summary of Investments Other than Investments in Related Parties
Cost	2,560
Fair Value	4,490
Amount at which shown in the Balance Sheet	4,490
Common stock
Summary of Investments Other than Investments in Related Parties
Cost	2,113
Fair Value	4,052
Amount at which shown in the Balance Sheet	4,052
Public utilities
Summary of Investments Other than Investments in Related Parties
Cost	14
Fair Value	17
Amount at which shown in the Balance Sheet	17
Banks, trust and insurance companies
Summary of Investments Other than Investments in Related Parties
Cost	1,646
Fair Value	3,388
Amount at which shown in the Balance Sheet	3,388
Industrial, miscellaneous and all other
Summary of Investments Other than Investments in Related Parties
Cost	453
Fair Value	647
Amount at which shown in the Balance Sheet	647
Preferred stock
Summary of Investments Other than Investments in Related Parties
Cost	24
Fair Value	27
Amount at which shown in the Balance Sheet	27
Mutual funds
Summary of Investments Other than Investments in Related Parties
Cost	423
Fair Value	411
Amount at which shown in the Balance Sheet	411
Mortgage and other loans receivable, net of allowance
Summary of Investments Other than Investments in Related Parties
Cost	20,765
Fair Value	21,637
Amount at which shown in the Balance Sheet	20,765
Other invested assets
Summary of Investments Other than Investments in Related Parties
Cost	27,343
Fair Value	27,699
Amount at which shown in the Balance Sheet	28,659
Short-term investments, at cost (approximates fair value)
Summary of Investments Other than Investments in Related Parties
Cost	21,617
Fair Value	21,617
Amount at which shown in the Balance Sheet	21,617
Derivative assets
Summary of Investments Other than Investments in Related Parties
Cost	1,665
Fair Value	1,665
Amount at which shown in the Balance Sheet	$ 1,665