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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, 2020 USD ($) plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 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 |  |
Compensation expense from award | $ 203 | $ 239 | $ 170
Recognized tax benefit from stock-based compensation arrangements | $ 43 | 50 | 34
Common Stock, Capital Shares Reserved for Future Issuance | shares | 7 |  |
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 | $ 12 | 15 | 39
Amended and Restated 2004 Stock Incentive Plan | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (in years) | 3 years |  |
Total fair value of awards vested | $ 140 | 122 | 139
Unrecognized compensation expense related to unvested awards, awards other than options | $ 166 |  |
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 |  |  |
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 | $ 82 | $ 92
Unrecognized compensation expense related to unvested awards, awards other than options | $ 34 |  |
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 | $ 0
Intrinsic value of stock options exercised | $ 65 | $ 10 | $ 94
Associate Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense from award | $ 30 | $ 25 | $ 23
Minimum | Amended and Restated 2004 Stock Incentive Plan | Performance Share Units |  |  |
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 |  |  |
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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