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

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Debt (Settled) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Debt (Settled) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Feb. 18, 2020	May 24, 2019
Debt
Debt retirement			$ 790	$ 640
Aggregate cash payment			830	658
Aggregate net gain (loss)	$ 4	$ (9)	$ (53)	(27)
6.50% Senior Notes due November 2020
Debt
Debt instrument interest rate stated percentage	6.50%		6.50%
Debt retirement			$ 8	57
6.375% Senior Notes due December 2021
Debt
Debt instrument interest rate stated percentage	6.375%		6.375%
Debt retirement			$ 38	78
3.80% Senior Notes due October 2022
Debt
Debt instrument interest rate stated percentage	3.80%		3.80%
Debt retirement			$ 8	193
5.375% Senior Secured Notes due May 2023
Debt
Debt instrument interest rate stated percentage	5.375%		5.375%			5.375%
Debt retirement			$ 22
9.00% Senior Notes due July 2023
Debt
Debt instrument interest rate stated percentage	9.00%		9.00%		9.00%
Debt retirement			$ 714	312
Tendered
Debt
Debt retirement			714	510
Aggregate cash payment			767	522
Aggregate net gain (loss)			(65)	(18)
Tendered \| 6.50% Senior Notes due November 2020
Debt
Debt retirement				57
Tendered \| 6.375% Senior Notes due December 2021
Debt
Debt retirement				63
Tendered \| 3.80% Senior Notes due October 2022
Debt
Debt retirement				190
Tendered \| 9.00% Senior Notes due July 2023
Debt
Debt retirement			714	200
Repurchased
Debt
Debt retirement			76	130
Aggregate cash payment			63	136
Aggregate net gain (loss)			12	(9)
Repurchased \| 6.50% Senior Notes due November 2020
Debt
Debt retirement			8
Repurchased \| 6.375% Senior Notes due December 2021
Debt
Debt retirement			38	15
Repurchased \| 3.80% Senior Notes due October 2022
Debt
Debt retirement			8	3
Repurchased \| 5.375% Senior Secured Notes due May 2023
Debt
Debt retirement			$ 22
Repurchased \| 9.00% Senior Notes due July 2023
Debt
Debt retirement				$ 112