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Capital Stock (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 15 Months Ended | 31 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jan. 31, 2018 | Jul. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 12,000,000,000 |  |  |  |  |  |  |  |  |
Increase in quarterly dividend rate | 8.20% |  |  |  |  |  |  |  |  |  |
Cash dividends declared (USD per share) | $ 0.66 | $ 2.54 | $ 0.61 | $ 2.35 | $ 2.17 |  |  |  |  |  |
Annualized dividend rate (USD per share) |  | $ 2.64 |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 41,604,141 |  | 16,221,001 | 10,682,419 |  |  |  |  |  |
Average price of repurchased shares (USD per share) |  | $ 70.10 |  | $ 63.48 | $ 51.83 |  |  |  |  |  |
Aggregate cost of shares repurchased |  | $ 2,917,000,000 |  | $ 1,030,000,000 | $ 554,000,000 |  |  |  |  |  |
July 2014 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Repurchase of common stock (in shares) |  |  |  |  |  | 20,400,000 |  |  |  |  |
Average price of repurchased shares (USD per share) |  |  |  |  |  | $ 48.90 |  |  |  |  |
July 2015 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 4,000,000,000 | $ 3,000,000,000 | $ 1,000,000,000 |
Repurchase of common stock (in shares) |  | 41,600,000 |  | 16,200,000 | 600,000 |  |  |  |  |  |
Average price of repurchased shares (USD per share) |  | $ 70.10 |  |  | $ 57.66 |  |  |  |  |  |
Aggregate cost of shares repurchased |  |  |  | $ 1,030,000,000 | $ 35,000,000 |  |  |  |  |  |
Amount remaining in the share repurchased program |  | $ 18,000,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares of common stock reserved for stock-based awards (in shares) |  | 41,688,666 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | July 2015 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  | 58,700,000 |  |  |  |
Average price of repurchased shares (USD per share) |  |  |  |  |  |  | $ 68.15 |  |  |  |
Subsequent Event [Member] | January 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |

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