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Stock-Based Compensation Plans - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) plan $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of active stock plans | plan | 1 |  |
Shares authorized under plans (in shares) | shares | 55 |  |
Shares available for grant under plans (in shares) | shares | 10 |  |
Compensation expense from award | $ 239 | $ 170 | $ 244
Recognized tax benefit from stock-based compensation arrangements | 50 | 34 | 92
Amended and Restated 2004 Stock Incentive Plan | Cash-Settled Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash payments to settle awards | $ 15 | 39 | 42
Amended and Restated 2004 Stock Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (in years) | 3 years |  |
Total fair value of awards vested | $ 122 | 139 | 110
Unrecognized compensation expense related to unvested awards, awards other than options | $ 157 |  |
Weighted-average period of recognition of unrecognized compensation costs (Years) | 1 year 9 months 18 days |  |
Amended and Restated 2004 Stock Incentive Plan | Performance Share Units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (in years) | 3 years |  |
Total fair value of awards vested | $ 82 | $ 92 | $ 90
Unrecognized compensation expense related to unvested awards, awards other than options | $ 42 |  |
Weighted-average period of recognition of unrecognized compensation costs (Years) | 1 year |  |
Amended and Restated 2004 Stock Incentive Plan | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (in years) | 3 years |  |
Maximum contractual term (in years) | 10 years |  |
Weighted-average fair value of options granted (in dollars per share) | $ / shares | $ 0 | $ 0 | $ 21.48
Intrinsic value of stock options exercised | $ 10 | $ 94 | $ 92
Associate Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense from award | $ 25 | $ 23 | $ 23
Minimum | Amended and Restated 2004 Stock Incentive Plan | Performance Share Units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Potential annual reduction in vesting based on performance (percent) | 50.00% |  |
Percentage of target award opportunities | 0.00% |  |
Maximum | Amended and Restated 2004 Stock Incentive Plan | Performance Share Units (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Potential annual reduction in vesting based on performance (percent) | 100.00% |  |
Percentage of target award opportunities | 150.00% |  |

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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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