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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Restricted Stock and Restricted Stock Units |  |
Unit and Shares Activity: |  |
Number of Shares - Nonvested - Beginning balance | 1,789 |
Number of Shares - Granted - Annual | 564 |
Number of Shares - Granted - Other | 8 |
Number of Shares - Vested | (679) |
Number of Shares - Forfeited | (35) |
Number of Shares - Nonvested - Ending balance | 1,647 |
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 | $ 180.02 |
Weighted Average Grant Date Fair Value - Granted - Annual | 200.41 |
Weighted Average Grant Date Fair Value - Granted - Other | 186.08 |
Weighted Average Grant Date Fair Value - Vested | 148.00 |
Weighted Average Grant Date Fair Value - Forfeited | 184.52 |
Weighted Average Grant Date Fair Value - Nonvested - Ending balance | $ 200.13 |
Compensation expense yet to be recognized | $ 109 |
Expense recognition period | 25 months |
Fair value that vested | $ 135 | $ 154
Tax benefit realized from vesting | $ 26 | 29
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 | 562 |
Number of Shares - Granted - Annual | 162 |
Number of Shares - Vested | (210) |
Number of Shares - Performance Change | (83) |
Number of Shares - Forfeited | (15) |
Number of Shares - Nonvested - Ending balance | 416 |
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 | $ 188.96 |
Weighted Average Grant Date Fair Value - Granted - Annual | 207.49 |
Weighted Average Grant Date Fair Value - Vested | 162.16 |
Weighted Average Grant Date Fair Value - Performance Change | 207.20 |
Weighted Average Grant Date Fair Value - Forfeited | 209.44 |
Weighted Average Grant Date Fair Value - Nonvested - Ending balance | $ 205.26 |
Compensation expense yet to be recognized | $ 27 |
Expense recognition period | 20 months |
Fair value that vested | $ 45 | 48
Tax benefit realized from vesting | $ 9 | $ 11
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 The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans. + References No definition available. + Details
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- Definition The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans, other than annual and performance shares. + References No definition available. + Details
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- Definition The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans, increased or decreased for performance change during the reporting period. + References No definition available. + 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 Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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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