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Stock Compensation Plans - Stock Option Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of Options (in thousands) |  |  |
Outstanding at beginning of year (in shares) | 4,599 |  |
Granted (in shares) | 988 |  |
Exercised (in shares) | (330) |  |
Forfeited (in shares) | (22) |  |
Expired (in shares) | (23) |  |
Outstanding at end of year (in shares) | 5,212 | 4,599 |
Number of Options (in thousands), Outstanding, fully vested and expected to vest (in shares) | 5,156 |  |
Number of Options (in thousands), Exercisable at end of year (in shares) | 3,331 |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of year (in USD per share) | $ 34.31 |  |
Granted (in USD per share) | 48.89 |  |
Exercised (in USD per share) | 26.47 |  |
Forfeited (in USD per share) | 51.98 |  |
Expired (in USD per share) | 90.26 |  |
Outstanding at end of year (in USD per share) | 37.25 | $ 34.31 |
Weighted Average Exercise Price, Outstanding, fully vested and expected to vest (in USD per share) | 37.66 |  |
Weighted Average Exercise Price, Exercisable at end of year (in USD per share) | $ 32.24 |  |
Weighted Average Remaining Contractual Term, Outstanding at end of year | 6 years 2 months |  |
Weighted Average Remaining Contractual Term, Outstanding, fully vested and expected to vest | 6 years 2 months |  |
Weighted Average Remaining Contractual Term, Exercisable at end of year | 5 years |  |
Aggregate Intrinsic Value, Outstanding at end of year | $ 97 |  |
Aggregate Intrinsic Value, Outstanding, fully vested and expected to vest | 94 |  |
Aggregate Intrinsic Value, Exercisable at end of year | $ 79 |  |
Employee Stock Option |  |  |
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items] |  |  |
Expected dividend yield | 1.90% | 2.00% | 1.80%
Expected annualized spot volatility minimum | 21.80% | 27.30% | 22.10%
Expected annualized spot volatility maximum | 37.90% | 41.30% | 39.40%
Weighted average annualized volatility | 29.50% | 34.10% | 32.70%
Risk-free spot rate minimum | 0.40% | 0.30% | 0.00%
Risk-free spot rate maximum | 2.40% | 1.80% | 2.60%
Expected term | 5 years | 5 years | 5 years

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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