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Equity
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Equity
Note 14: Equity
Common Stock
In the aggregate, holders of our Class A common stock have 662/3% of the voting power of our common stock and holders of our Class B common stock have 331/3% of the voting power of our common stock, which percentage is generally non-dilutable under the terms of our articles of incorporation. Each share of our Class B common stock is entitled to 15 votes. The number of votes held by each share of our Class A common stock depends on the number of shares of Class A and Class B common stock outstanding at any given time. The 331/3% aggregate voting power of our Class B common stock cannot be diluted by additional issuances of any other class of common stock. Our Class B common stock is convertible, share for share, into Class A common stock, subject to certain restrictions.
Shares of Common Stock Outstanding
 
 
 
(in millions)
A

 
B

Balance, December 31, 2015
4,875

 
9

Stock compensation plans
23

 
—

Repurchases and retirements of common stock
(161
)
 
—

Employee stock purchase plans
5

 
—

Balance, December 31, 2016
4,742

 
9

Stock compensation plans
19

 
—

Repurchases and retirements of common stock
(131
)
 
—

Employee stock purchase plans
5

 
—

Balance, December 31, 2017
4,635

 
9

Stock compensation plans
15

 
—

Repurchases and retirements of common stock
(140
)
 
—

Employee stock purchase plans
7

 
—

Balance, December 31, 2018
4,517

 
9


Share Repurchases
Effective January 1, 2017, our Board of Directors increased our share repurchase program authorization to a total of $12.0 billion, which does not have an expiration date. As of December 31, 2018, $2.0 billion remained under this authorization.
Share Repurchases Under Share Repurchase Program Authorization
Year ended December 31 (in millions)
2018

 
2017

 
2016

Cash consideration
$
5,000

 
$
5,000

 
$
5,000

Shares repurchased
140

 
131

 
161

Accumulated Other Comprehensive Income (Loss)
 
 
 
December 31 (in millions)
2018

 
2017

Unrealized gains (losses) on marketable securities
$
3

 
$
(43
)
Deferred gains (losses) on cash flow hedges
55

 
9

Unrecognized gains (losses) on employee benefit obligations
325

 
260

Cumulative translation adjustments
(751
)
 
153

Accumulated other comprehensive income (loss), net of deferred taxes
$
(368
)
 
$
379