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Capital Stock (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 31, 2025 | Mar. 31, 2024 | Jan. 31, 2024 | Jan. 31, 2023 | Oct. 31, 2021 | Jan. 31, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 12,000,000,000 |  |  |  |  |  |  |  |
Common stock, dividend increase, percentage | 4.10% |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared (USD per share) | $ 1.02 | $ 0.98 |  | $ 4.00 | $ 3.84 | $ 3.68 |  |  |  |  |  |
Common stock, dividend rate, annual, per share (USD per share) |  |  |  | $ 4.08 |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  | 73,497,623 | 22,748,842 | 38,156,312 |  |  |  |  |  |
January 2021 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 | $ 2,000,000,000.0
Repurchase of common stock (in shares) |  |  |  |  |  | 38,100,000 |  |  |  |  |  |
January 2023 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |
Repurchase of common stock (in shares) |  |  |  |  | 22,700,000 |  |  |  |  |  |  |
January 2024 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 3,400,000,000 | $ 1,000,000,000.0 |  |  |
Repurchase of common stock (in shares) |  |  |  | 73,500,000 |  |  |  |  |  |  |  |
ASR Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 2,400,000,000 | $ 2,400,000,000 |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 53,900,000 | 53,900,000 |  |  |  |  |  |  |  |
January 2025 Share Repurchase Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Serial Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Preferred stock, par value (USD per share) |  |  |  | $ 1.00 |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |
Share-based Payment Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock reserved for stock-based awards (in shares) |  |  |  | 23,991,145 |  |  |  |  |  |  |  |

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