Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Summary of Investments, Other than Investments in Related Parties, Cost Summary of Investments, Other than Investments in Related Parties, Fair Value Summary of Investments, Other than Investments in Related Parties, Carrying Amount
US Government and Government Agencies and Authorities [Member] US Treasury Securities [Member] 836,000,000 855,000,000 855,000,000
US Government Corporations and Agencies Securities [Member] 4,392,000,000 4,439,000,000 4,439,000,000
US States and Political Subdivisions [Member] 13,152,000,000 13,489,000,000 13,489,000,000
Foreign Government Debt [Member] 999,000,000 1,053,000,000 1,053,000,000
Public Utility, Bonds [Member] 4,500,000,000 4,577,000,000 4,577,000,000
All Other Corporate Bonds [Member] 29,618,000,000 29,621,000,000 29,621,000,000
Mortgage-backed and Asset-backed Securities, Other [Member] 27,221,000,000 26,015,000,000 26,015,000,000
Mandatorily Redeemable Financial Instrument [Member] 6,000,000 6,000,000 6,000,000
Fixed Maturities [Member] 80,724,000,000 80,055,000,000 80,055,000,000
Common Stocks, by Industry [Member] Public Utility, Equities [Member] 1,000,000 1,000,000 1,000,000
Banks, Trust and Insurance, Equities [Member] 3,000,000 3,000,000 3,000,000
Industrial, Miscellaneous, and All Others [Member] 328,000,000 514,000,000 514,000,000
Nonredeemable Preferred Stock [Member] 2,279,000,000 2,077,000,000 2,077,000,000
Equity Securities, Available-for-sale [Member] 2,611,000,000 2,595,000,000 2,595,000,000
Equity Securites, Held-for-trading [Member] 30,489,000,000 36,182,000,000 36,182,000,000
Equity Securities, Investment Summary [Member] 33,100,000,000 38,777,000,000 38,777,000,000
Real Estate Investment [Member] 35,000,000 35,000,000 35,000,000
Mortgage Loans on Real Estate [Member] 5,410,000,000 5,407,000,000 5,410,000,000
Short-term Investments [Member] 1,602,000,000 1,602,000,000 1,602,000,000
Policy Loans [Member] 2,061,000,000 2,061,000,000 2,061,000,000
Investments in Partnerships and Trusts [Member] 2,566,000,000 2,566,000,000 2,566,000,000
Futures, Options, and Other [Member] 407,000,000 580,000,000 580,000,000
Other Investments [Member] 12,046,000,000 12,216,000,000 12,219,000,000
Summary of Investments, by Type [Domain] 125,905,000,000 131,083,000,000 131,086,000,000