Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Attributable to Parent [Abstract]

Schedule of Stock Repurchases

The following table summarizes our stock repurchases under the above-described programs (in millions, except per share data):

	Year ended December 31,
	2017 (1)		2016 (2)		2015 (3)
Shares repurchased and retired	13		123		95
Amount	$	954	$	11,001	$	10,002
Average price per share	$	71.79	$	89.15	$	104.91
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Notes:
(1)	All repurchases were under the 2016 Program.
(2)	Includes 36 million shares repurchased for $3.0 billion under the 2016 Program and 87 million shares repurchased for $8.0 billion under the 2015 Program.
(3)	Includes 65 million shares repurchased for $7.0 billion under the 2015 Program and 30 million shares repurchased for $3.0 billion under the 2014 Program.

Reduction to common stock and APIC as a result of stock repurchases

The following table summarizes the reduction of common stock and APIC and the charge to retained earnings as a result of our stock repurchases (in millions):

	Year ended December 31,
	2017		2016		2015
Reduction of common stock and APIC	$	34	$	302	$	223
Charge to retained earnings	$	1,028	$	10,883	$	10,115

Schedule of Dividends Declared

The following table summarizes cash dividends declared on our common stock (in millions, except per share data):

	2017				2016
	Dividend Per Share		Amount		Dividend Per Share		Amount
First quarter	$	0.52	$	685	$	0.43	$	587
Second quarter	0.52		685		0.47		631
Third quarter	0.52		685		0.47		625
Fourth quarter	0.52		687		0.47		622
Total	$	2.08	$	2,742	$	1.84	$	2,465

Schedule of accumulated OCI by component

The following table summarizes the changes in AOCI by component, net of tax (in millions):

	Foreign Currency Translation			Unrealized Gains and Losses on Available-for-Sale Securities			Unrealized Gains and Losses on Cash Flow Hedges			Total
Balance at December 31, 2015	$	(45	)	$	(16	)	$	149		$	88
Other comprehensive income before reclassifications	177			7			5			189
Amounts reclassified from accumulated other comprehensive income	—			(7		)	8			1
Net current period other comprehensive income	177			—			13			190
Balance at December 31, 2016	132			(16		)	162			278
Other comprehensive income (loss) before reclassifications	(47		)	218			(304		)	(133		)
Amounts reclassified from accumulated other comprehensive income	—			(8		)	28			20
Net current period other comprehensive income (loss)	(47		)	210			(276		)	(113		)
Balance at December 31, 2017	$	85		$	194		$	(114	)	$	165