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Capital Stock (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 15 Months Ended | 18 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Mar. 31, 2013 | Jul. 31, 2015 | Jul. 31, 2014 | Aug. 31, 2013 | Apr. 30, 2013 | Oct. 31, 2012 | Oct. 31, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 12,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared (USD per share) | $ 0.565 | $ 0.52 | $ 2.17 | $ 2.00 | $ 1.84 |  |  |  |  |  |  |  |  |
Annualized dividend rate (USD per share) | $ 2.26 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 10,682,419 | 22,452,599 | 16,652,913 |  |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased |  |  | $ 554,000,000 | $ 939,000,000 | $ 600,000,000 |  |  |  |  |  |  |  |  |
Average price of repurchased shares (USD per share) |  |  | $ 51.83 | $ 41.79 | $ 36.05 |  |  |  |  |  |  |  |  |
October 2011 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 | $ 1,000,000,000
Repurchase of common stock (in shares) |  |  |  |  |  |  |  | 48,300,000 |  |  |  |  |  |
Average price of repurchased shares (USD per share) |  |  |  |  |  |  |  | $ 31.06 |  |  |  |  |  |
April 2013 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 | $ 300,000,000 |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  | 27,100,000 |  |  |  |  |  |  |
Average price of repurchased shares (USD per share) |  |  |  |  |  |  | $ 36.97 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Aggregate cost of shares repurchased |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |
Average price of repurchased shares (USD per share) |  |  | $ 57.66 |  |  |  |  |  |  |  |  |  |  |
Amount remaining in the share repurchased program |  |  | $ 965,000,000 |  |  |  |  |  |  |  |  |  |  |
Serial Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in quarterly dividend rate | 8.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock reserved for stock-based awards (in shares) |  |  | 42,209,751 |  |  |  |  |  |  |  |  |  |  |

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