v3.8.0.1

Investments (Concentrations of Financial Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | $ 66,152 | $ 61,611
Concentration of credit risk at fair value | 78,104 | 74,692
Investments in South Korean government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 9,440 | 7,625
Concentration of credit risk at fair value | 11,004 | 9,479
Trading account assets | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 657 | 537
Concentration of credit risk at fair value | 667 | 550
Trading account assets | Investments in South Korean government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 15 | 44
Concentration of credit risk at fair value | 15 | 44
Other trading account assets | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 23 | 16
Concentration of credit risk at fair value | 23 | 16
Other trading account assets | Investments in South Korean government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 0 | 0
Concentration of credit risk at fair value | 0 | 0
Available-for-sale | Fixed Maturities | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 64,628 | 60,240
Concentration of credit risk at fair value | 76,311 | 73,051
Available-for-sale | Fixed Maturities | Investments in South Korean government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 9,425 | 7,581
Concentration of credit risk at fair value | 10,989 | 9,435
Held-to-maturity | Fixed Maturities | Investments in Japanese government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 844 | 818
Concentration of credit risk at fair value | 1,103 | 1,075
Held-to-maturity | Fixed Maturities | Investments in South Korean government and government agency securities: |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Concentration of credit risk at amortized cost | 0 | 0
Concentration of credit risk at fair value | $ 0 | $ 0

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