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Earnings Per Share - Narrative (Details) - USD ($) shares in Millions | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 22, 2018 | Jul. 17, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 20, 2018 | Feb. 28, 2018 | Jan. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Share repurchase program |  |  | $ 5,000,000,000 |  | $ 5,000,000,000 |  |  | $ 1,500,000,000.0 |
Shares repurchased value |  |  | $ 974,000,000 | $ 499,000,000 | $ 1,810,000,000 | $ 757,000,000 |  |  |
Accelerated share repurchase program (payment) receipt amount | $ 30,000,000 |  |  |  |  |  | $ 450,000,000 |  | $ 150,000,000
Initial share value received |  |  |  |  |  |  | $ 360,000,000 |  | $ 120,000,000
Initial shares received |  |  |  |  |  |  | 6 |  |
Shares repurchased during the period (in shares) | 3 |  | 16 | 9 | 31 | 15 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Antidilutive securities |  |  | 1 | 10 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |
Accelerated share repurchase program (payment) receipt amount |  | $ 90,000,000 |  |  |  |  |  |  |
Shares repurchased during the period (in shares) |  | 7 |  |  |  |  |  |  |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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