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Financing Arrangements - Notes (Details) - USD ($) $ in Millions			12 Months Ended
	Jul. 09, 2020	Jun. 08, 2020	Dec. 31, 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%
Principal amount			$ 600
3.9% senior notes due June 1, 2050
Financing Arrangements
Debt, interest rate (as a percent)			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%
Term loan credit agreement due April 12, 2021
Financing Arrangements
Long-term debt, current			$ 380

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Amount of debt instrument redeemed.

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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 discount.

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