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Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 17, 2020	Dec. 31, 2019	Feb. 01, 2019
Principal amount
Total principal amount of debt	$ 9,246		$ 9,361
Debt due within one year	595		581
Long-term debt	8,651		8,780
Carrying amount
Total debt	9,157		9,261
Debt due within one year	581		568
Long-term debt	8,576		8,693
6.50% Senior Notes due November 2020
Principal amount
Total principal amount of debt	198		206
Debt due within one year	198		206
Carrying amount
Total debt	198		206
Debt due within one year	$ 198		206
Debt instrument interest rate stated percentage	6.50%
6.375% Senior Notes due December 2021
Principal amount
Total principal amount of debt	$ 184		222
Carrying amount
Total debt	$ 184		221
Debt instrument interest rate stated percentage	6.375%
5.52% Senior Notes due May 2022
Principal amount
Total principal amount of debt	$ 178		200
Debt due within one year	89		88
Carrying amount
Total debt	176		198
Debt due within one year	$ 88		87
Debt instrument interest rate stated percentage	5.52%
3.80% Senior Notes due October 2022
Principal amount
Total principal amount of debt	$ 187		190
Debt due within one year	5
Carrying amount
Total debt	186		189
Debt due within one year	$ 5
Debt instrument interest rate stated percentage	3.80%
0.50% Exchangeable Bonds due January 2023
Principal amount
Total principal amount of debt	$ 863		863
Carrying amount
Total debt	$ 862		862
Debt instrument interest rate stated percentage	0.50%
5.375% Senior Secured Notes due May 2023
Principal amount
Total principal amount of debt	$ 519		525
Debt due within one year	32		16
Carrying amount
Total debt	513		518
Debt due within one year	$ 29		14
Debt instrument interest rate stated percentage	5.375%
9.00% Senior Notes due July 2023
Principal amount
Total principal amount of debt			714
Carrying amount
Total debt			701
Debt instrument interest rate stated percentage	9.00%
5.875% Senior Secured Notes due January 2024
Principal amount
Total principal amount of debt	$ 626		667
Debt due within one year	83		83
Carrying amount
Total debt	616		656
Debt due within one year	$ 79		79
Debt instrument interest rate stated percentage	5.875%
7.75% Senior Secured Notes due October 2024
Principal amount
Total principal amount of debt	$ 420		420
Debt due within one year	60		60
Carrying amount
Total debt	412		412
Debt due within one year	$ 58		58
Debt instrument interest rate stated percentage	7.75%
6.25% Senior Notes due December 2024
Principal amount
Total principal amount of debt	$ 437		437
Debt due within one year	62		62
Carrying amount
Total debt	430		430
Debt due within one year	$ 60		60
Debt instrument interest rate stated percentage	6.25%
6.125% Senior Secured Notes due August 2025
Principal amount
Total principal amount of debt	$ 501		534
Debt due within one year	66		66
Carrying amount
Total debt	492		525
Debt due within one year	$ 64		64
Debt instrument interest rate stated percentage	6.125%
7.25% Senior Notes due November 2025
Principal amount
Total principal amount of debt	$ 750		750
Carrying amount
Total debt	$ 738		737
Debt instrument interest rate stated percentage	7.25%
7.50% Senior Notes due January 2026
Principal amount
Total principal amount of debt	$ 750		750
Carrying amount
Total debt	$ 743		743
Debt instrument interest rate stated percentage	7.50%
6.875% Senior Secured Notes due February 2027
Principal amount
Total principal amount of debt	$ 550		550
Carrying amount
Total debt	$ 541		541
Debt instrument interest rate stated percentage	6.875%			6.875%
8.00% Senior Unsecured Notes due February 2027
Principal amount
Total principal amount of debt	$ 750
Carrying amount
Total debt	$ 743
Debt instrument interest rate stated percentage	8.00%	8.00%
7.45% Notes due April 2027
Principal amount
Total principal amount of debt	$ 88		88
Carrying amount
Total debt	$ 86		86
Debt instrument interest rate stated percentage	7.45%
8.00% Debentures due April 2027
Principal amount
Total principal amount of debt	$ 57		57
Carrying amount
Total debt	$ 57		57
Debt instrument interest rate stated percentage	8.00%
7.00% Notes due June 2028
Principal amount
Total principal amount of debt	$ 300		300
Carrying amount
Total debt	$ 306		306
Debt instrument interest rate stated percentage	7.00%
7.50% Notes due April 2031
Principal amount
Total principal amount of debt	$ 588		588
Carrying amount
Total debt	$ 585		585
Debt instrument interest rate stated percentage	7.50%
6.80% Senior Notes due March 2038
Principal amount
Total principal amount of debt	$ 1,000		1,000
Carrying amount
Total debt	$ 992		991
Debt instrument interest rate stated percentage	6.80%
7.35% Senior Notes due December 2041
Principal amount
Total principal amount of debt	$ 300		300
Carrying amount
Total debt	$ 297		$ 297
Debt instrument interest rate stated percentage	7.35%

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