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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restricted Stock and Restricted Stock Units |  |  |
Unit and Shares Activity: |  |  |
Number of Shares - Nonvested - Beginning balance | 1,994 | 2,185 | 2,441
Number of Shares - Granted - Annual | 467 | 604 | 749
Number of Shares - Granted - Other | 8 | 21 | 8
Number of Shares - Vested | (640) | (769) | (960)
Number of Shares - Forfeited | (40) | (47) | (53)
Number of Shares - Nonvested - Ending balance | 1,789 | 1,994 | 2,185
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures |  |  |
Weighted Average Grant Date Fair Value - Nonvested - Beginning balance | $ 162.60 | $ 145.64 | $ 127.47
Weighted Average Grant Date Fair Value - Granted - Annual | 233.61 | 176.10 | 148.20
Weighted Average Grant Date Fair Value - Granted - Other | 207.76 | 233.77 | 169.00
Weighted Average Grant Date Fair Value - Vested | 164.83 | 127.21 | 101.64
Weighted Average Grant Date Fair Value - Forfeited | 186.48 | 158.25 | 145.95
Weighted Average Grant Date Fair Value - Nonvested - Ending balance | $ 180.02 | $ 162.60 | $ 145.64
Compensation expense yet to be recognized | $ 74,000,000 |  |
Expense recognition period | 21 months |  |
Fair value that vested | $ 155,000,000 | $ 136,000,000 | $ 149,000,000
Tax benefit realized from vesting | $ 29,000,000 | $ 45,000,000 | $ 56,000,000
Vesting or performance period | 3 years |  |
Value of dividend equivalents for restricted stock units that are forfeited | $ 0 |  |
Impact on basic earnings per share due to restricted stock units dividends | $ 0 |  |
Performance Shares |  |  |
Unit and Shares Activity: |  |  |
Number of Shares - Nonvested - Beginning balance | 686 | 656 | 871
Number of Shares - Granted - Annual | 166 | 201 | 219
Number of Shares - Vested | (206) | (314) | (367)
Number of Shares - Performance Change | (56) | 155 | (38)
Number of Shares - Forfeited | (28) | (12) | (29)
Number of Shares - Nonvested - Ending balance | 562 | 686 | 656
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures |  |  |
Weighted Average Grant Date Fair Value - Nonvested - Beginning balance | $ 171.90 | $ 142.98 | $ 120.89
Weighted Average Grant Date Fair Value - Granted - Annual | 229.13 | 191.28 | 160.17
Weighted Average Grant Date Fair Value - Vested | 159.82 | 124.88 | 99.06
Weighted Average Grant Date Fair Value - Performance Change | 198.39 | 173.91 | 155.98
Weighted Average Grant Date Fair Value - Forfeited | 204.09 | 171.36 | 149.08
Weighted Average Grant Date Fair Value - Nonvested - Ending balance | $ 188.96 | $ 171.90 | $ 142.98
Compensation expense yet to be recognized | $ 18,000,000 |  |
Expense recognition period | 10 months |  |
Fair value that vested | $ 48,000,000 | $ 55,000,000 | $ 54,000,000
Tax benefit realized from vesting | $ 11,000,000 | $ 15,000,000 | $ 15,000,000
Vesting or performance period | 3 years |  |
Performance shares awarded at estimated number of shares at the end of the performance period | 100.00% |  |
Performance Shares | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures |  |  |
Expense recognition period | 3 years |  |
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions | 200.00% |  |
Performance Shares | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures |  |  |
Expense recognition period | 1 year |  |
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions | 0.00% |  |

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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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=109197908&loc=d3e5070-113901 + Details
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