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Stockholders' Equity - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 $ / shares | Dec. 31, 2016 USD ($) vote $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Jun. 30, 2015 $ / shares | Dec. 31, 2016 USD ($) vote $ / shares shares | Dec. 31, 2015 USD ($) $ / shares | Oct. 31, 2016 USD ($) | Oct. 31, 2015 USD ($)
Equity, Class of Treasury 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 | $ 0.28 | $ 0.24 | $ 0.84 | $ 0.80 |  |
Authorized stock repurchase amount (shares) |  |  |  |  |  |  | $ 4,000,000,000 | $ 2,000,000,000
Stock repurchased during the period (shares) | shares |  | 14,000,000 | 1,900,000 |  | 14,000,000 |  |  |
Stock repurchased during the period |  |  |  |  | $ 2,000,000,000 |  |  |
Average cost per share (dollars per share) | $ / shares |  | $ 140.96 | $ 186.99 |  | $ 140.96 |  |  |
Treasury shares retired (shares) | shares |  |  | 115,500,000 |  |  |  |  |
Treasury shares retired during the year |  |  | $ 7,800,000,000 |  |  |  |  |
Authorized amount available for future repurchases |  | $ 3,000,000,000 |  |  | $ 3,000,000,000 |  |  |
Net foreign currency translation gains (losses) |  | (30,000,000) |  |  | (95,000,000) |  |  |
Translation gain (loss) attributable to redeemable noncontrolling interest |  |  | (32,000,000) |  |  | $ (2,000,000) |  |
Amounts reclassified to income statement |  | 0 | 0 |  | 20,000,000 | 0 |  |
Net actuarial gains (losses) attributable to redeemable noncontrolling interest |  | (2,000,000) | 1,000,000 |  | (3,000,000) | $ (5,000,000) |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury shares retired during the year |  |  | 6,300,000,000 |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury shares retired during the year |  |  | $ 1,500,000,000 |  |  |  |  |
Foreign Currency Translation Adjustments, Net of Tax |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Net foreign currency translation gains (losses) |  | $ (31,000,000) |  |  | $ (97,000,000) |  |  |

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