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Shareholders' Equity - Additional Information (Details) - USD ($) | May 01, 2018 | Mar. 31, 2018
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$210 billion share repurchase program in effect as of March 31, 2018 |  |
Stock Repurchase Program [Line Items] |  |
Maximum amount authorized for repurchase of common stock |  | $ 210,000,000,000
Share repurchase program, amount utilized |  | $ 199,600,000,000
$100 billion share repurchase program announced on May 1, 2018 | Subsequent event |  |
Stock Repurchase Program [Line Items] |  |
Maximum amount authorized for repurchase of common stock | $ 100,000,000,000 |

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