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Stock-Based and Other Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based compensation expense We recognized total stock-based compensation expense as follows:
 
 
Year Ended December 31,
(millions)
 
2018
 
2017
 
2016
Stock-Based Compensation Expense Included in:
 
 
 
 
 
 
General and Administrative Expense
 
$
54

 
$
56

 
$
62

Exploration Expense and Other
 
8

 
48

 
15

Total Stock-Based Compensation Expense
 
$
62

 
$
104

 
$
77

Tax Benefit Recognized
 
$
(13
)
 
$
(36
)
 
$
(27
)
Valuation Assumptions, Options The assumptions used in valuing stock options granted were as follows:
 
 
Year Ended December 31,
(weighted averages)
 
2018
 
2017
 
2016
Expected Term (in Years)
 
6.7

 
6.4

 
6.3

Expected Volatility
 
33.4
%
 
33.2
%
 
32.4
%
Risk-Free Rate
 
2.6
%
 
2.2
%
 
1.6
%
Expected Dividend Yield
 
1.2
%
 
0.9
%
 
0.7
%
Weighted Average Grant-Date Fair Value
 
$
10.47

 
$
13.26

 
$
10.10

Award Activity, Options Stock option activity was as follows:
 
 
Options
 
Weighted
Average
Exercise
 Price
 
Weighted
Average
Remaining
 Contractual Term
 
Aggregate
 Intrinsic Value
 
 
 
 
(per share)
 
(in years)
 
(in millions)
Outstanding at December 31, 2017
 
15,549,222

 
$
43.42

 
 
 
 
Granted
 
551,888

 
30.20

 
 
 
 
Exercised
 
(576,617
)
 
34.55

 
 
 
 
Forfeited
 
(1,672,473
)
 
40.04

 
 
 
 
Outstanding at December 31, 2018
 
13,852,020

 
$
44.04

 
5.0
 
$

Exercisable at December 31, 2018
 
11,866,188

 
$
45.58

 
4.0
 
$

Valuation Assumptions, Restricted Stock The assumptions used in valuing market based restricted stock awards granted were as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
Number of Simulations
10,000,000

 
500,000

 
500,000

Expected Volatility
35
%
 
35
%
 
38
%
Risk-Free Rate
2.3
%
 
1.5
%
 
1.0
%
Award Activity, Restricted Stock Restricted stock activity was as follows:
 
 
Subject to Time Vesting
 
Subject to Market Conditions
 
 
Number of Shares
 
Weighted
Average
Award Date
 Fair Value
 
Number of Shares
 
Weighted Average Award Date Fair Value
 
 
 
 
(per share)
 
 
 
(per share)
Outstanding at December 31, 2017
 
1,839,737

 
$
37.21

 
1,212,705

 
$
25.55

Awarded
 
2,702,426

 
30.68

 
874,960

 
19.56

Vested
 
(982,280
)
 
35.28

 

 

Forfeited
 
(386,992
)
 
32.65

 
(702,031
)
 
25.52

Outstanding at December 31, 2018
 
3,172,891

 
$
32.72

 
1,385,634

 
$
21.74


Award Activity, Phantom Units Phantom unit activity was as follows:
 
 
Subject to Time Vesting
 
Subject to Market Conditions
 
 
Number of Units
 
Weighted
Average
Award Date
 Fair Value
 
Number of Units
 
Weighted Average Award Date Fair Value
 
 
 
 
(per share)
 
 
 
(per share)
Outstanding at December 31, 2017
 
610,159

 
$
31.65

 
167,483

 
$
6.82

Vested
 
(83,276
)
 
31.65

 

 

Forfeited
 
(59,518
)
 
31.65

 
(17,187
)
 
6.82

Outstanding at December 31, 2018
 
467,365

 
$
31.65

 
150,296

 
$
6.82

Schedule of components for Rabbi Trust Components of that rabbi trust are as follows:
 
 
December 31,
(millions, except share amounts)
 
2018
 
2017
Mutual Fund Investments
 
$
38

 
$
57

Noble Energy Common Stock (at Fair Value)
 
5

 
14

Total Rabbi Trust Assets
 
$
43

 
$
71

Liability Under Related Deferred Compensation Plan
 
$
43

 
$
71

Number of Shares of Noble Energy Common Stock Held by Rabbi Trust
 
267,792

 
470,030