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Fair Value Instruments - Convertible Debt (Details) - 1.250 Convertible Senior Notes due 2025 - Convertible Debt - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount	$ 2,300	$ 2,300
Unamortized debt discount	(318)	(355)
Net carrying amount	$ 1,982	$ 1,945

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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