Long-Term Debt Issuances and Retirements (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt due within one year	$ (754)	$ (1)
Long-term debt	19,922	11,353
Access Midstream Partners, L.P. [Member]
Debt Instrument [Line Items]
Credit facility loans	466
Other, including capital lease obligations	6
Premium on debt	244
Total long-term debt, including current portion	4,366
Long-term debt due within one year	(4)
Long-term debt	4,362
5.875% Senior Unsecured Notes due 2021 [Member] | Access Midstream Partners, L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	750
Long-term debt interest rate	5.875%
6.125% Senior Unsecured Notes due 2022 [Member] | Access Midstream Partners, L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	750
Long-term debt interest rate	6.125%
4.875% Senior Unsecured Notes due 2023 [Member] | Access Midstream Partners, L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	1,400
Long-term debt interest rate	4.875%
4.3% Senior Unsecured Notes due 2024 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	1,000
Long-term debt interest rate	4.30%
4.55% Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt face amount	1,250
Long-term debt interest rate	4.55%
4.875% Senior Unsecured Notes due 2024 [Member] | Access Midstream Partners, L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	750
Long-term debt interest rate	4.875%
3.9% Senior Unsecured Notes due 2025 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	750
Long-term debt interest rate	3.90%
5.4% Senior Unsecured Notes due 2044 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	500
Long-term debt interest rate	5.40%
5.75% Senior Unsecured Notes due 2044 [Member]
Debt Instrument [Line Items]
Long-term debt face amount	650
Long-term debt interest rate	5.75%
4.9% Senior Unsecured Notes due 2045 [Member] | Williams Partners L.P. [Member]
Debt Instrument [Line Items]
Long-term debt face amount	500
Long-term debt interest rate	4.90%
$1.75 Billion Secured Credit Facility [Member] | Access Midstream Partners, L.P. [Member]
Debt Instrument [Line Items]
Credit facility loans	$ 466