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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2020	May 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 3,548				$ 2,300
Issuance costs and discounts	260				11
Total debt	3,288				2,289
Less current portion of long-term debt	(140)				(450)
Long-term debt	3,148				1,839
Senior notes
Debt Instrument [Line Items]
Long-term debt	2,060				1,839
7.50% Senior notes due 2020 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		7.50%
Long-term debt	0				450
3.45% Senior Notes due 2021 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		3.45%	3.45%
Long-term debt	140				500
3.95% Senior notes due 2022 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		3.95%
Long-term debt	244				600
0.25% Convertible Senior notes due 2025 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		0.25%		0.25%
Long-term debt	1,323				0
Issuance costs and discounts	(235)
Total debt	1,088
4.45% Senior notes due 2026 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		4.45%
Long-term debt	500				500
7.20% Senior notes due 2028 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		7.20%
Long-term debt	241				250
1.90% Senior notes due 2030 [Member] \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		1.90%
Long-term debt	1,100				$ 0
Issuance costs and discounts	(19)
Total debt	$ 1,080