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Long-Term Obligations and Commitments - Senior Unsecured Notes (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2020	Oct. 31, 2020	Jul. 31, 2020
Debt Instrument [Line Items]
Long-term debt		$ 2,032	$ 2,031
Senior Unsecured Notes \| The Senior Unsecured Notes Member
Debt Instrument [Line Items]
Proceeds from issuance	$ 1,980
Unamortized discount	2
Debt issuance costs	$ 15
Long-term debt, gross		2,000	2,000
Unamortized discount and debt issuance costs		(16)	(17)
Long-term debt		1,984	1,983
Redemption price (in percent)	101.00%
Senior Unsecured Notes \| 0.650% notes due July 2023
Debt Instrument [Line Items]
Long-term debt, gross		$ 500	500
Effective Interest Rate		0.837%
Stated interest rate (in percent)		0.65%
Senior Unsecured Notes \| 0.950% notes due July 2025
Debt Instrument [Line Items]
Long-term debt, gross		$ 500	500
Effective Interest Rate		1.127%
Stated interest rate (in percent)		0.95%
Senior Unsecured Notes \| 1.350% notes due July 2027
Debt Instrument [Line Items]
Long-term debt, gross		$ 500	500
Effective Interest Rate		1.486%
Stated interest rate (in percent)		1.35%
Senior Unsecured Notes \| 1.650% notes due July 2030
Debt Instrument [Line Items]
Long-term debt, gross		$ 500	$ 500
Effective Interest Rate		1.767%
Stated interest rate (in percent)		1.65%