Stock-Based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Weighted-Average Remaining Contractual Term	4 years 2 months 12 days
Options Outstanding, Aggregate Intrinsic Value	$ 15,000,000
Maximum number of shares reserved for grant awards under the plan	13,900,000
Number of shares counted against reserve for determining number of shares of stock available for grant under the Plan for each option	1
Number of shares counted against reserve for each share of stock granted, other than option or stock appreciation right	1.61
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	6,000,000.0
Maximum number of underlying shares that may be granted to a participant in any one calendar year	5,000,000.0
Stock options, shares
Outstanding at the beginning of the period (in shares)	5,059,892
Exercised (in shares)	(321,465)	(629,186)	(462,647)
Forfeited (in shares)	(6,527)
Expired (in shares)	(162,859)
Outstanding at the end of the period (in shares)	4,569,041	5,059,892
Exercisable balance at the end of the period (in shares)	4,569,041
Stock option activity, weighted-average exercise price
Outstanding at the beginning of the period, Weighted-Average Exercise Price (in dollars per share)	$ 39.88
Exercised, Weighted-Average Exercise Price (in dollars per share)	25.95
Forfeited, Weighted-Average Exercise Price (in dollars per share)	30.95
Expired, Weighted-Average Grant Date Fair Value (in dollars per share)	52.86
Outstanding at the end of the period, Weighted-Average Exercise Price (in dollars per share)	40.41	$ 39.88
Exercisable balance at the end of the period, Weighted-Average Exercise Price (in dollars per share)	$ 40.41
Selected amounts pertaining to stock option exercises:
Proceeds from issuances of common stock under employee stock plans	$ 5,000,000	$ 19,000,000	$ 12,000,000
Stock-based compensation costs
Stock-based compensation expense	26,000,000	28,000,000	21,000,000
Income tax benefit	(6,000,000)	(6,000,000)	(4,000,000)
Stock-based compensation expense, net of income taxes	20,000,000	22,000,000	17,000,000
Excess tax benefit from stock-based compensation	$ (3,000,000)	$ (7,000,000)	$ (6,000,000)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(22,000,000)	(11,000,000)	(3,000,000)
Options Exercisable, Weighted-Average Remaining Contractual Term	4 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 15,000,000
EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromVestingOfEquityInstrumentsOtherThanOptions	$ 5,000,000	$ 3,000,000	$ 1,000,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life	10 years
Selected amounts pertaining to stock option exercises:
Proceeds from issuances of common stock under employee stock plans	$ 8,000,000	18,000,000	12,000,000
Actual tax benefit realized from stock option exercises	1,000,000	3,000,000	2,000,000
Pre-tax intrinsic value of stock options exercised	$ 4,000,000	$ 12,000,000	$ 10,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	50,895	36,567
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 27.51	$ 41.84
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	50,895
Selected amounts pertaining to stock option exercises:
Vesting period	3 years
Restricted stock activity, weighted-average exercise price
Granted, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 27.51	$ 41.84	$ 40.40
Stock-based compensation costs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(36,567)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 41.84
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 0
Restricted Stock \| Non-management member of Board of Directors
Selected amounts pertaining to stock option exercises:
Vesting period	1 year
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	614,094	693,960
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 43.70	$ 40.14
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	316,154
Restricted stock activity, weighted-average exercise price
Granted, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 45.23	$ 41.94	43.09
Stock-based compensation costs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(372,855)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 38.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(23,165)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 44.13
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	445,498	304,834
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 45.72	$ 44.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	210,869
Restricted stock activity, weighted-average exercise price
Granted, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 47.93	$ 43.09	$ 44.59
Stock-based compensation costs
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 7,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(58,460)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 48.68
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(11,745)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 45.97
Restricted Stock Units and Restricted Stock Awards [Member]
Stock-based compensation costs
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 14,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days

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Represents the contractual term over which the equity based award expires.

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Represents the number of shares counted against the maximum shares reserved for issuance for each grant of stock options.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted-Average Exercise Price [Roll Forward] [Roll Forward]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted-Average Exercise Price [Roll Forward]

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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