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Debt - Additional information (Details) - USD ($) $ in Millions		3 Months Ended
	Jul. 09, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
2.9% senior notes due June 1, 2030 and 3.9% senior notes due June 1, 2050
Financing Arrangements
Discount		$ 7
Debt issuance costs capitalized		$ 9
2.9% senior notes due June 1, 2030
Financing Arrangements
Debt, interest rate (as a percent)		2.90%		2.90%
Principal amount		$ 600
3.9% senior notes due June 1, 2050
Financing Arrangements
Debt, interest rate (as a percent)		3.90%		3.90%
Principal amount		$ 400
Revolving credit facility
Financing Arrangements
Repayments of long-term debt		$ 394
4.625% senior notes due November 1, 2020
Financing Arrangements
Debt, interest rate (as a percent)		4.625%			4.625%
Principal amount					$ 400
Amount of debt redeemed	$ 400
Debt redemption price	409
Accrued interest portion of debt redemption price	4
"Make whole" premium portion of debt redemption price	$ 5
5.62% senior notes due March 25, 2020
Financing Arrangements
Repayments of long-term debt			$ 200
Debt, interest rate (as a percent)			5.62%		5.62%

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Amount of debt instrument redeemed.

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Amount at which debt redeemed by the issuer, including accrued interest.

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The accrued interest portion of the debt redemption price.

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The "make whole" premium portion of the debt redemption price.

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- Definition

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

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-Publisher FASB
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- Definition

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

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Amount, after accumulated amortization, of debt discount.

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

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