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Earnings Per Share - Additional Information (Detail) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jul. 18, 2016 | Dec. 31, 2015
Earnings Loss Per Share [Line Items] |  |  |  |
Amount remaining under repurchase programs | $ 255,000,000 | $ 255,000,000 |  |
Share repurchase program authorized amount |  |  |  | $ 3,000,000,000
Subsequent Event |  |  |  |
Earnings Loss Per Share [Line Items] |  |  |  |
Share repurchase program authorized amount |  |  | $ 2,000,000,000 |
Open Market Repurchase Program |  |  |  |
Earnings Loss Per Share [Line Items] |  |  |  |
Number of shares repurchased | 15 | 42 |  |
Repurchases of common stock | $ 694,000,000 | $ 2,200,000,000 |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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