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Stock Repurchase Programs - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 26, 2017
Stock Repurchase Program [Abstract] |  |  |  |
Stock repurchased and retired during period (in shares) | 12,700,000 | 7,400,000 | 11,300,000 |
Stock repurchased and retired during period, cost | $ 3,390 | $ 1,439 | $ 2,099 |
New stock repurchase program (in shares) |  |  |  | 50,000,000
Remaining number of shares authorized to be repurchased (in shares) | 8,000,000 |  |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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