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Investments - Scheduled maturities for fixed income securities (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 4,038 |
Due after one year through five years | 28,963 |
Due after five years through ten years | 16,216 |
Due after ten years | 6,944 |
Subtotal | 56,161 |
ABS, RMBS and CMBS | 1,457 |
Amortized cost | 57,618 | $ 57,525
Fair value |  |
Due in one year or less | 4,042 |
Due after one year through five years | 28,812 |
Due after five years through ten years | 15,987 |
Due after ten years | 7,263 |
Subtotal | 56,104 |
ABS, RMBS and CMBS | 1,559 |
Total fixed income securities | $ 57,663 | $ 58,992

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- Definition This item represents the total of all debt securities grouped by maturity dates excluding asset-backed securities, residential mortgage-backed securities and commercial mortgage-backed securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are classified neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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