Investments - Maturities of Available-for-sale and Held-to-maturity Securities (Details) $ in Millions |
May 13, 2018
USD ($)
|
|---|---|
| Available-for-sale, Cost Basis | |
| Due in one year or less | $ 207 |
| Due after one year through five years | 687 |
| Due after five years | 20 |
| Available-for-sale, cost basis, total | 914 |
| Available-for-sale, Fair Value | |
| Due in one year or less | 206 |
| Due after one year through five years | 672 |
| Due after five years | 19 |
| Available-for-sale, recorded basis, total | 897 |
| Held-to-maturity | |
| Due in one year or less | 270 |
| Due after one year through five years | 0 |
| Due after five years | 0 |
| Held-to-maturity, cost basis, total | $ 270 |