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Investments - Maturities of Available-for-sale and Held-to-maturity Securities (Details)
$ in Millions
Feb. 18, 2018
USD ($)
Available-for-sale, Cost Basis  
Due in one year or less $ 188
Due after one year through five years 727
Due after five years 36
Available-for-sale, cost basis, total 951
Available-for-sale, Fair Value  
Due in one year or less 188
Due after one year through five years 714
Due after five years 35
Available-for-sale, recorded basis, total 937
Held-to-maturity  
Due in one year or less 112
Due after one year through five years 0
Due after five years 0
Held-to-maturity, cost basis, total $ 112