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Debt - Senior Notes (Details) - USD ($)		1 Months Ended	12 Months Ended
	Jun. 02, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 17, 2020
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		4.875%	4.875%
Repayment of credit facility			$ 0	$ 0	$ 300,000,000
Net carrying amount of debt		$ 2,150,000,000	$ 2,150,000,000
Senior Notes | 4.375% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		4.375%	4.375%
Aggregate principal amount of notes outstanding	$ 800,000,000
Deferred issuance costs	11,000,000
Net carrying amount of debt		$ 800,000,000	$ 800,000,000
Senior Notes | 5.375% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		5.375%	5.375%
Aggregate principal amount of notes outstanding		$ 700,000,000	$ 700,000,000
Net carrying amount of debt		$ 700,000,000	$ 700,000,000
Senior Notes | 3.875% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		3.875%	3.875%
Net carrying amount of debt		$ 650,000,000	$ 650,000,000
Senior Notes | 4.875% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		4.875%	4.875%
Aggregate principal amount of notes outstanding		$ 330,000,000	$ 330,000,000
Deferred issuance costs						$ 10,000,000
Settled percent		100.00%
Unpaid interest		$ 8,000,000	8,000,000
Unamortized issuance cost		$ 3,000,000	$ 3,000,000
Convertible Debt | 4.375% Notes
Debt Instrument [Line Items]
Repayment of credit facility	$ 600,000,000
Convertible Debt | 4.875% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes		4.875%	4.875%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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