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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Williams Companies Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Option Rollfoward and related information [Table Text Block]
The following summary reflects stock option activity and related information for the year ended December 31, 2014:
Stock Options
Options
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 
(Millions)
 
 
 
(Millions)
Outstanding at December 31, 2013
6.7

 
$
21.82

 
 
Granted
0.8

 
$
41.76

 
 
Exercised
(1.7
)
 
$
17.93

 
 
Outstanding at December 31, 2014
5.8

 
$
25.86

 
$
110

Exercisable at December 31, 2014
4.0

 
$
21.25

 
$
96
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]
The following table summarizes additional information related to stock option activity during each of the last three years:
 
Years Ended December 31,
 
2014
 
2013
 
2012
 
(Millions)
Total intrinsic value of options exercised
$
48

 
$
23

 
$
69

Tax benefits realized on options exercised
$
18

 
$
9

 
$
25

Cash received from the exercise of options
$
31

 
$
13

 
$
50
Stock Options Schedule of Valuation Assumptions [Table Text Block]
The estimated fair value at date of grant of options for our common stock granted in each respective year, using the Black-Scholes option pricing model, is as follows: 
 
2014
 
2013
 
2012
Weighted-average grant date fair value of options for our common stock granted during the year, per share
$
7.50

 
$
5.94

 
$
5.65

Weighted-average assumptions:
 
 
 
 
 
Dividend yield
4.2
%
 
4.3
%
 
3.7
%
Volatility
28.0
%
 
29.7
%
 
30.0
%
Risk-free interest rate
2.2
%
 
1.4
%
 
1.3
%
Expected life (years)
6.5

 
6.5

 
6.5
Nonvested Restricted Stock Unit Rollforward and related information [Table Text Block]
The following summary reflects nonvested restricted stock unit activity and related information for the year ended December 31, 2014.
Restricted Stock Units Outstanding
Shares
 
Weighted-
Average
Fair Value (1)
 
(Millions)
 
 
Nonvested at December 31, 2013
3.5

 
$
27.16

Granted
1.4

 
$
42.79

Forfeited
(0.1
)
 
$
29.57

Vested
(1.2
)
 
$
24.07

Nonvested at December 31, 2014
3.6

 
$
33.90

______________
(1)
Performance-based restricted stock units are valued utilizing a Monte Carlo valuation method using measures of total shareholder return. Certain of the performance based restricted stock units are subject to a holding period of up to two years after the vesting date. Discounts for the restrictions of liquidity were applied to the estimated fair value at the date of the awards and ranged from 5.83 percent to 15.58 percent. The discounts were developed using the Chaffe model and the Finnerty model. All other restricted stock units are valued at the grant-date market price or the grant-date market price less dividends projected to be paid over the vesting period. Restricted stock units generally vest after three years.
Other restricted stock unit information [Table Text Block]
Value of Restricted Stock Units
2014
 
2013
 
2012
Weighted-average grant date fair value of restricted stock units granted during the year, per share
$
42.79

 
$
30.43

 
$
20.61

Total fair value of restricted stock units vested during the year ($’s in millions)
$
27

 
$
27

 
$
22
Access Midstream Partners Long Term Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested Restricted Stock Unit Rollforward and related information [Table Text Block]
The following summary reflects nonvested ACMP restricted stock unit activity and related information for the six months ended December 31, 2014:
Restricted Stock Units Outstanding
Units
 
Weighted-
Average
Fair Value
 
(Millions)
 
 
Granted
1.3

 
$
59.67

Forfeited
—

 
$
63.89

Vested
—

 
$
63.75

Nonvested at December 31, 2014
1.3

 
$
59.35