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Borrowings and Other Obligations Fair and carrying value of long-term debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 2,098	$ 2,098
Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	460	455
Fair Value, Inputs, Level 2 \| Senior Notes \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	2,190	1,628
Fair Value, Inputs, Level 2 \| Secured Debt \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 524	$ 507

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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