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Equity - Narrative (Details) |  |  |  |  |  |  |  |  |  |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Feb. 12, 2019 USD ($) shares | Feb. 07, 2019 USD ($) | Sep. 07, 2018 $ / shares shares | Mar. 14, 2018 USD ($) $ / shares shares | Mar. 12, 2018 USD ($) | May 19, 2017 shares | Feb. 06, 2017 USD ($) $ / shares shares | Feb. 02, 2017 USD ($) | Jun. 20, 2016 $ / shares shares | Mar. 10, 2016 USD ($) $ / shares shares | Mar. 08, 2016 USD ($) | Mar. 11, 2018 USD ($) | [1] | May 19, 2017 $ / shares | Dec. 31, 2018 USD ($) employee_stock_ownership_plan $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Feb. 28, 2019 USD ($) | Dec. 31, 2015 USD ($) | Oct. 23, 2014 USD ($)
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  | $ 5,000,000,000 |  |  |  |  |  |  |  |  |  |  | $ 11,000,000,000
Amount of remaining shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,200,000,000 |  |  |  |  |  |  |  |
Accelerated share repurchases, cash paid |  |  |  |  |  |  |  |  |  | $ (5,000,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased | shares |  |  |  |  |  |  |  |  | 18,000,000 | 136,000,000 |  |  |  | 307,000,000 | [1] | 150,000,000 | [2] | 154,000,000 | [3] |  |  |
Shares repurchased, initial price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 29.36 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, percentage of agreement |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, final average price paid (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 32.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of purchase |  |  |  |  |  |  |  |  |  |  |  | $ 8,200,000,000 |  | $ 12,198,000,000 | [1],[4] | $ 5,000,000,000 | [2],[4] | $ 5,000,000,000 | [3],[4] |  |  |
Number of employee stock ownership plans | employee_stock_ownership_plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Common ESOP Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ESOP compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,000,000 |  | 11,000,000 |  | $ 9,000,000 |  |  |  |
Preferred Stock [Member] | Series A, Convertible Preferred Stock [Member] | Preferred Employee Stock Ownership Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A convertible perpetual preferred stock, dividends rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |  |  |  |
Series A convertible perpetual preferred stock, per share stated value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,300 |  |  |  |  |  |  |  |
Preferred stock, redemption price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,300 |  |  |  |  |  |  |  |
Common Stock [Member] | Preferred Employee Stock Ownership Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A convertible perpetual preferred stock, common stock shares when converted (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,574.87 |  |  |  |  |  |  |  |
Convertible preferred stock, number of shares convertible | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Common Stock [Member] | Common ESOP Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares in ESOP | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,000,000 |  |  |  |  |  |  |  |
December 2015 Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000,000 |
December 2017 Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000,000 |  |  |  |  |  |
Amount of remaining shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,200,000,000 |  |  |  |  |  |  |  |
December 2018 Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000,000 |  |  |  |  |  |  |  |
Share Repurchase Agreement with Citibank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized in stock purchase plan, value |  |  |  |  | $ 4,000,000,000 |  |  | $ 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases, cash paid |  |  |  | $ (4,000,000,000) |  |  | $ (5,000,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased | shares |  |  | 21,000,000 | 87,000,000 |  | 24,000,000 | 126,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased, initial price per share (in dollars per share) | $ / shares |  |  |  | $ 36.61 |  |  | $ 31.73 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, percentage of agreement |  |  |  |  | 80.00% |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, final average price paid (in dollars per share) | $ / shares |  |  | $ 36.86 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, average price paid per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.31 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized in stock purchase plan, value |  | $ 6,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of remaining shares authorized in stock purchase plan, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,300,000,000 |  |
Accelerated share repurchases, cash paid | $ 6,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased | shares | 130,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, percentage of agreement |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on March 12, 2018, as well as other share repurchases. See above for additional information.
[2] | Represents shares purchased pursuant to the accelerated share repurchase agreement with Citibank entered into on February 2, 2017. See above for additional information.
[3] | Represents shares purchased pursuant to the accelerated share repurchase agreement entered into on March 8, 2016. See above for additional information.
[4] | Amounts may not add due to rounding.

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