Debt	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Debt	DebtOn March 3, 2020, we issued $1.0 billion aggregate principal amount of 2.92% senior notes due March 2030. Subsequently, on March 5, 2020, we completed a tender offer to purchase $1.5 billion aggregate principal amount of senior notes using proceeds from the debt issuance and cash on hand. The tender offer consisted of $500 million of 3.50% senior notes due August 2023 and $1.0 billion of 3.80% senior notes due November 2025. This early debt repurchase resulted in a $168 million loss on extinguishment, which included a tender premium, unamortized discounts and costs on the retired notes, and other tender fees. These costs were included in "Loss on early extinguishment of debt" on our condensed consolidated statements of operations for the six months ended June 30, 2020.The $1.0 billion senior notes issued in March rank equally with our existing and future senior unsecured indebtedness, have semiannual interest payments, and have no sinking fund requirements. We may redeem some or all of the notes at any time at the applicable redemption prices, plus accrued and unpaid interest.