The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross amount of debt extinguished.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt (Settled) (Details) - USD ($) $ in Millions		3 Months Ended
Debt (Settled) (Details) - USD ($) $ in Millions	Feb. 26, 2021	Mar. 31, 2021	Mar. 31, 2020
Debt
Debt retirement		$ 324	$ 769
Aggregate cash payment		12	813
Aggregate principal amount of debt issued in exchanges		294
Aggregate net gain (loss)		$ 51	(57)
6.50% Senior Notes due November 2020
Debt
Debt instrument interest rate stated percentage		6.50%
Debt retirement			8
6.375% Senior Notes due December 2021
Debt
Debt instrument interest rate stated percentage		6.375%
Debt retirement			38
3.80% Senior Notes due October 2022
Debt
Debt instrument interest rate stated percentage		3.80%
Debt retirement			3
0.50% Exchangeable Senior Bonds due January 2023
Debt
Debt instrument interest rate stated percentage		0.50%
Debt retirement		$ 323
Aggregate cash payment	$ 11
5.375% Senior Secured Notes due May 2023
Debt
Debt instrument interest rate stated percentage		5.375%
Debt retirement		$ 1	6
9.00% Senior Notes due July 2023
Debt
Debt instrument interest rate stated percentage		9.00%
Debt retirement			714
Redeemed
Debt
Debt retirement			714
Aggregate cash payment			767
Aggregate net gain (loss)			(65)
Redeemed \| 9.00% Senior Notes due July 2023
Debt
Debt retirement			714
Repurchased
Debt
Debt retirement		$ 1	55
Aggregate cash payment		1	46
Aggregate net gain (loss)			8
Repurchased \| 6.50% Senior Notes due November 2020
Debt
Debt retirement			8
Repurchased \| 6.375% Senior Notes due December 2021
Debt
Debt retirement			38
Repurchased \| 3.80% Senior Notes due October 2022
Debt
Debt retirement			3
Repurchased \| 5.375% Senior Secured Notes due May 2023
Debt
Debt retirement		1	$ 6
Exchanged
Debt
Debt retirement		323
Aggregate cash payment		11
Aggregate principal amount of debt issued in exchanges		294
Aggregate net gain (loss)		51
Exchanged \| 0.50% Exchangeable Senior Bonds due January 2023
Debt
Debt retirement		$ 323