Debt	3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	On February 23, 2018, we issued $1,400 of fixed rate senior notes consisting of $350 due March 1, 2023 that bear an annual interest rate of 2.8%, $350 due March 1, 2028 that bear an annual interest rate of 3.25%, $350 due March 1, 2038 that bear an annual interest rate of 3.55%, and $350 due March 1, 2048 that bear an annual interest rate of 3.625%. The notes are unsecured senior obligations and rank equally in right of payment with our existing and future unsecured and unsubordinated indebtedness. The net proceeds of the issuance totaled $1,338, after deducting underwriting discounts, commissions and offering expenses.

Debt

3 Months Ended

Mar. 31, 2018

On February 23, 2018, we issued $1,400 of fixed rate senior notes consisting of $350 due March 1, 2023 that bear an annual interest rate of 2.8%, $350 due March 1, 2028 that bear an annual interest rate of 3.25%, $350 due March 1, 2038 that bear an annual interest rate of 3.55%, and $350 due March 1, 2048 that bear an annual interest rate of 3.625%. The notes are unsecured senior obligations and rank equally in right of payment with our existing and future unsecured and unsubordinated indebtedness. The net proceeds of the issuance totaled $1,338, after deducting underwriting discounts, commissions and offering expenses.