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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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Face (par) amount of the original debt instrument that was repurchased.

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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		12 Months Ended
Debt (Settled) (Details) - USD ($) $ in Millions	Oct. 16, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 05, 2019	Jul. 11, 2017
Debt
Total debt		$ 9,261	$ 9,978
Aggregate net loss		$ (41)	(3)	$ (55)
2.50% Senior Notes due October 2017
Debt
Debt instrument interest rate stated percentage	2.50%
Aggregate debt repurchase				271
Aggregate principal amount repaid	$ 152			62
6.00% Senior Notes due March 2018
Debt
Aggregate debt repurchase				400
Aggregate principal amount repaid				354
7.375% Senior Notes due April 2018
Debt
Aggregate debt repurchase				128
Aggregate principal amount repaid				83
6.50% Senior Notes due November 2020
Debt
Debt instrument interest rate stated percentage		6.50%
Total debt		$ 206	288
Aggregate debt repurchase		57		207
Aggregate principal amount repaid		$ 23		15
6.375% Senior Notes due December 2021
Debt
Debt instrument interest rate stated percentage		6.375%
Total debt		$ 221	327
Aggregate debt repurchase		63		213
Aggregate principal amount repaid		$ 43		10
3.80% Senior Notes due October 2022
Debt
Debt instrument interest rate stated percentage		3.80%
Total debt		$ 189	408
Aggregate debt repurchase		190
Aggregate principal amount repaid		$ 32	95	33
9.00% Senior Notes due July 2023
Debt
Debt instrument interest rate stated percentage		9.00%
Total debt		$ 701	1,221
Aggregate debt repurchase		200
Aggregate principal amount repaid		336
Debt Repurchases
Debt
Aggregate principal amount repaid		434	95	557
Aggregate cash payment		449	95	564
Aggregate net loss		(23)		(7)
Tendered Notes
Debt
Tender Offer Principal Amount					$ 700	$ 1,500
Aggregate debt repurchase		510		1,219
Aggregate cash payment		522		1,269
Aggregate net loss		(18)		(48)
Aggregate of unspecified debt
Debt
Aggregate principal amount repaid		$ 354	257	$ 299
Songa
Debt
Aggregate cash payment			$ 1,650