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Equity-based participation plans for associates (Details 5) - Non-vested shares granted [member] $ / shares in Units, Pure in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares
Schedule of unvested restricted stock units [roll forward] |  |
Number of shares at beginning of period | 25.8 | 25.7
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement at beginning of period | $ / shares | $ 71.1 | $ 77.1
Fair value at grante date at beginning of period | $ | $ 1,835 | $ 1,981
Vested, number of shares | (13.8) | (13.3)
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement | $ / shares | $ 74.2 | $ 80.3
Vested, fair value at grante date | $ | $ (1,024) | $ (1,068)
Forfeited, number of shares | (2.0) | (4.3)
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement | $ / shares | $ 75.3 | $ 76.3
Forfeited, fair value at grante date | $ | $ (151) | $ (328)
Number of shares at end of period | 24.8 | 25.8
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement at end of period | $ / shares | $ 78.9 | $ 71.1
Fair value at grante date at end of period | $ | $ 1,957 | $ 1,835
Annual incentive |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 1.1 | 1.1
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 93.7 | $ 78.4
Granted, fair value at grante date | $ | $ 103 | $ 86
Share savings plans |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 4.2 | 4.2
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 95.0 | $ 83.0
Granted, fair value at grante date | $ | $ 399 | $ 349
Select North America |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 3.3 | 5.3
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 86.7 | $ 64.0
Granted, fair value at grante date | $ | $ 286 | $ 339
Select outside North America |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 2.0 | 2.6
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 89.4 | $ 67.4
Granted, fair value at grante date | $ | $ 179 | $ 175
Long-Term Performance Plan |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 2.5 | 2.5
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 85.1 | $ 68.9
Granted, fair value at grante date | $ | $ 213 | $ 172
Long-Term Relative Performance Plan |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 0.2 | 0.1
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 0.0 | $ 0.0
Granted, fair value at grante date | $ | $ 0 | $ 0
Other share awards |  |
Schedule of unvested restricted stock units [roll forward] |  |
Granted, number of shares | 1.5 | 1.9
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares | $ 78.0 | $ 67.7
Granted, fair value at grante date | $ | $ 117 | $ 129

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