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Stock Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee service share based compensation aggregate disclosures [Abstract] |  |  |  |  |  |  |
Share based compensation cost |  | $ 55,000,000 |  | $ 46,000,000 |  | $ 37,000,000 |
Share-based Payment Arrangement, Expense, Tax Benefit |  | 0 |  |  |  |  |
Total unrecognized compensation cost related to share-based compensation arrangements |  | $ 64,000,000 |  |  |  |  |
Weighted average period of time over which unrecognized compensation cost is to be recognized |  | 1 year 9 months 18 days |  |  |  |  |
The remaining number of RSU's or stock options that may be issued (in shares) |  | 27,000,000 |  |  |  |  |
Employee stock purchase plan [Abstract] |  |  |  |  |  |  |
The remaining balance of shares originally authorized for issue under the employee stock purchase plan (in shares) |  | 7,000,000 |  |  |  |  |
The percentage of market value at which shares may be issued to participating employees (in hundredths) |  | 90.00% |  |  |  |  |
The number of shares issued to participants under the plan during the period |  | 821,000 |  | 661,000 |  | 544,000 |
The weighted average fair value of each purchase right under the employee stock purchase plan (in dollars per share) |  | $ 47.60 |  | $ 50.73 |  | $ 50.13 |
The discount percentage off the market value for the employee stock purchase plan (in hundredths) |  | 10.00% |  |  |  |  |
The aggregate cost of the discount from the market value on shares issued to employees at the end of each monthly purchase period | [1] | $ 5.29 |  | $ 5.64 |  | $ 5.57 |
Stock Compensation Plan - Board of Directors |  |  |  |  |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |  |  |  |  |
Non-option equity instruments granted (in shares) |  | 31,000 |  | 28,000 |  | 26,000 |
Weighted average price of non-option equity instruments granted |  | $ 52.01 |  | $ 53.01 |  | $ 57.04 |
RSUs |  |  |  |  |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |  |  |  |  |
Vesting periods for plans |  | 3 years |  |  |  |  |
The remaining number of RSU's or stock options that may be issued (in shares) |  | 20,000,000 |  |  |  |  |
Units (000) |  |  |  |  |  |  |
Outstanding RSU's - beginning balance (in shares) |  | 1,342,000 |  | 1,294,000 |  | 1,439,000 |
Granted (in shares) |  | 994,000 | [2] | 782,000 | [3] | 717,000 | [4]
Vested (in shares) |  | (744,000) |  | (670,000) |  | (806,000) |
Surrendered (in shares) |  | (47,000) |  | (64,000) |  | (56,000) |
Outstanding RSU's - ending balance (in shares) |  | 1,545,000 |  | 1,342,000 |  | 1,294,000 |
Wtd. Average Fair Value (per share) |  |  |  |  |  |  |
Weighted average grant date fair value RSU's - beginning balance (in dollars per share) |  | $ 52.56 |  | $ 45.32 |  | $ 36.52 |
Weighted average grant date fair value RSU's - granted (in dollars per share) |  | 57.49 |  | 60.80 |  | 52.73 |
Weighted average grant date fair value RSU's - vested (in dollars per share) |  | 42.42 |  | 45.11 |  | 30.23 |
Weighted average grant date fair value RSU's - surrendered (in dollars per share) |  | 57.72 |  | 47.05 |  | 43.86 |
Weighted average grant date fair value RSU's - period end (in dollars per share) |  | $ 57.65 |  | $ 52.56 |  | $ 45.32 |
Performance Shares |  |  |  |  |  |  |
Units (000) |  |  |  |  |  |  |
Granted (in shares) |  | 387,000 |  | 308,000 |  | 235,000 |
Minimum | Performance Shares |  |  |  |  |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |  |  |  |  |
Percentage of PBRSUs to be granted |  | 0.00% |  |  |  |  |
Maximum | Performance Shares |  |  |  |  |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |  |  |  |  |
Percentage of PBRSUs to be granted |  | 200.00% |  |  |  |  |
[1] | The weighted-average fair value of each purchase right under the ESPP granted is equal to a ten percent discount from the market value of the Common Stock at the end of each monthly purchase period.
[2] | Includes 387 thousand PBRSUs
[3] | Includes 308 thousand PBRSUs
[4] | Includes 235 thousand PBRSUs

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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