Consolidated Summary of Investments - Other Than Investments in Related Parties (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	$ 265,283
Amount at Which Shown on Balance Sheet	280,714
Fixed Maturities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	173,604
Estimated Fair Value	188,911
Amount at Which Shown on Balance Sheet	188,911
Foreign government
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	3,153
Estimated Fair Value	3,844
Amount at Which Shown on Balance Sheet	3,844
U.S. Treasury and agency
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	34,391
Estimated Fair Value	39,070
Amount at Which Shown on Balance Sheet	39,070
Public utilities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	14,945
Estimated Fair Value	16,861
Amount at Which Shown on Balance Sheet	16,861
State and political subdivision
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	5,329
Estimated Fair Value	6,520
Amount at Which Shown on Balance Sheet	6,520
All other corporate bonds
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	71,950
Estimated Fair Value	77,200
Amount at Which Shown on Balance Sheet	77,200
Total bonds
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	129,768
Estimated Fair Value	143,495
Amount at Which Shown on Balance Sheet	143,495
Mortgage-backed and asset-backed securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	42,804
Estimated Fair Value	44,302
Amount at Which Shown on Balance Sheet	44,302
Redeemable preferred stock
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	1,032
Estimated Fair Value	1,114
Amount at Which Shown on Balance Sheet	1,114
Trading and fair value option securities
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	720
Estimated Fair Value	705
Amount at Which Shown on Balance Sheet	705
Equity Securities, Investment Summary [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	1,926
Estimated Fair Value	2,065
Amount at Which Shown on Balance Sheet	2,065
Industrial, miscellaneous and all other
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	1,236
Estimated Fair Value	1,352
Amount at Which Shown on Balance Sheet	1,352
Non-redeemable preferred stock
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	690
Estimated Fair Value	713
Amount at Which Shown on Balance Sheet	713
Mortgage loans held-for-investment
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	49,059
Amount at Which Shown on Balance Sheet	49,059
Policy loans
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	8,491
Amount at Which Shown on Balance Sheet	8,491
Real estate and real estate joint ventures
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	7,595
Amount at Which Shown on Balance Sheet	7,595
Real estate acquired in satisfaction of debt
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	279
Amount at Which Shown on Balance Sheet	279
Other limited partnership interests
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	4,926
Amount at Which Shown on Balance Sheet	4,926
Short-term investments
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	4,474
Amount at Which Shown on Balance Sheet	4,474
Other invested assets
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost or Amortized Cost	14,209
Amount at Which Shown on Balance Sheet	$ 14,209