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Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 $ / shares | Dec. 31, 2015 USD ($) vote $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2015 $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2015 USD ($) vote $ / shares | Dec. 31, 2014 USD ($) $ / shares | Oct. 31, 2015 USD ($) | May. 31, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share of common stock outstanding, vote on proposals | vote |  | 1 |  |  |  | 1 |  |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.28 | $ 0.28 |  | $ 0.24 | $ 0.24 | $ 0.80 | $ 0.72 |  |
Authorized amount of company's common stock by board |  |  |  |  |  |  |  | $ 2,000,000,000 | $ 500,000,000
Amount of shares bought (in shares) | shares |  | 1.9 | 2.5 |  |  |  |  |  |
Average price per share (in dollars per share) | $ / shares |  | $ 186.99 | $ 196.20 |  |  |  |  |  |
Authorized amount available for future repurchases |  | $ 1,600,000,000 | $ 0 |  |  | $ 1,600,000,000 |  |  |
Treasury shares retired | shares |  | 115.5 |  |  |  |  |  |  |
Translation loss attributable to redeemable noncontrolling interest |  | $ 32,000,000 |  |  |  | 2,000,000 | $ 39,000,000 |  |
Net foreign currency translation losses attributable to noncontrolling interest |  |  |  |  | $ 13,000,000 |  | $ 164,000,000 |  |
Net actuarial gains (losses) attributable to redeemable noncontrolling interest |  | 1,000,000 |  |  |  | $ (5,000,000) |  |  |
Treasury Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Retired amount of treasury shares previously repurchased |  | 7,800,000,000 |  |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Retired amount of treasury shares previously repurchased |  | 6,300,000,000 |  |  |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Retired amount of treasury shares previously repurchased |  | $ 1,500,000,000 |  |  |  |  |  |  |

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