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Investments - Amortized Cost and Fair Values of Fixed Maturity and Equity Securities (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | $ 37,985 | $ 38,234
Gross Unrealized Gains | 2,757 | 1,986
Gross Unrealized Losses | 140 | 521
Estimated Fair Value | 40,602 | 39,699
Unrealized OTTI Losses (Gains) | (25) | (20)
Corporate Bonds and Other [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 19,296 | 18,764
Gross Unrealized Gains | 1,269 | 791
Gross Unrealized Losses | 99 | 395
Estimated Fair Value | 20,466 | 19,160
States, Municipalities and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 9,279 | 9,681
Gross Unrealized Gains | 1,299 | 1,076
Gross Unrealized Losses |  | 9
Estimated Fair Value | 10,578 | 10,748
Residential Mortgage-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 4,760 | 4,815
Gross Unrealized Gains | 92 | 68
Gross Unrealized Losses | 20 | 57
Estimated Fair Value | 4,832 | 4,826
Unrealized OTTI Losses (Gains) | (22) | (20)
Commercial Mortgage-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 2,026 | 2,200
Gross Unrealized Gains | 53 | 28
Gross Unrealized Losses | 7 | 32
Estimated Fair Value | 2,072 | 2,196
Other Asset-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 1,877 | 1,975
Gross Unrealized Gains | 25 | 11
Gross Unrealized Losses | 12 | 24
Estimated Fair Value | 1,890 | 1,962
Unrealized OTTI Losses (Gains) | (3) |
Total Asset-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 8,663 | 8,990
Gross Unrealized Gains | 170 | 107
Gross Unrealized Losses | 39 | 113
Estimated Fair Value | 8,794 | 8,984
Unrealized OTTI Losses (Gains) | (25) | (20)
U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 162 | 156
Gross Unrealized Gains | 3 | 3
Gross Unrealized Losses | 1 |
Estimated Fair Value | 164 | 159
Foreign Government [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 502 | 480
Gross Unrealized Gains | 12 | 5
Gross Unrealized Losses | 1 | 4
Estimated Fair Value | 513 | 481
Redeemable Preferred Stock [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 10 | 10
Estimated Fair Value | 10 | 10
Total Fixed Maturities Available-for-Sale [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 37,912 | 38,081
Gross Unrealized Gains | 2,753 | 1,982
Gross Unrealized Losses | 140 | 521
Estimated Fair Value | 40,525 | 39,542
Unrealized OTTI Losses (Gains) | (25) | (20)
Fixed Maturities Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 73 | 153
Gross Unrealized Gains | 4 | 4
Estimated Fair Value | $ 77 | $ 157

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