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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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Earnings Loss Per Share [Line Items]

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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)
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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