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Shareholders' Equity - Repurchases (Details) - USD ($) shares in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2017 | Jan. 31, 2017 | Jan. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Aug. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchased during the period (in shares) |  |  |  |  | 55.4 | 47.5 |  |
Stock repurchased during the period |  |  |  |  | $ 4,400,000,000 | $ 4,500,000,000 |  |
2016 Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Purchases not to exceed |  |  |  |  |  |  | $ 15,000,000,000.0 |
Repurchase authorizations remaining at period end |  |  |  |  |  |  | 13,900,000,000 |
2014 Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Purchases not to exceed |  |  |  |  |  |  | 10,000,000,000.0 |
Repurchase authorizations remaining at period end |  |  |  |  |  |  | $ 0 |
Accelerated share repurchases agreement amount |  |  |  | $ 725,000,000 |  |  |  | $ 3,600,000,000
Accelerated share repurchases percent of notional amount received in shares |  | 80.00% |  | 80.00% |  |  |  |
Number of shares purchased (in shares) |  | 36.1 |  | 6.2 |  |  |  |
Amount of repurchases under the program |  | $ 2,900,000,000 |  | $ 580,000,000 |  |  |  |
Accelerated share repurchases, maximum number of shares | 9.9 | 9.9 | 1.4 |  |  |  |  |
Accelerated share repurchases, percent of notional amount in shares to be received at end of program | 20.00% |  | 20.00% |  |  |  |  |
Foreign Exchange Forward | 2014 Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  | $ 700,000,000 |  | $ 145,000,000 |  |  |  |

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