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Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow [Line Items]
Interest paid	$ 107	$ 113	$ 111
Income taxes paid, net of refunds received	78	90	55
Cash receipts upon exercise of stock options	1	29	5
Cash disbursements for payment of taxes	(10)	(11)	(4)
Net cash receipts (disbursements) from exercise of stock options and vesting of other stock awards	$ (9)	$ 18	$ 1
Common Shares
Supplemental Cash Flow [Line Items]
Common Shares withheld (in shares)	452,000	1,550,000	145,000
Aggregate value of Common Shares withheld	$ 23	$ 73	$ 6

X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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For net-share settlement of share-based awards when the employer withholds shares for the exercise price and income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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For net-share settlement of share-based awards when the employer withholds shares for the exercise price and income tax withholding obligations, this element represents the value of shares the employees use to repay the employer.

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Disclosure of supplemental cash flow items.

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