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Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Jul. 03, 2017
Jun. 05, 2017
Apr. 15, 2017
Apr. 03, 2017
Feb. 23, 2017
Feb. 01, 2017
Dec. 31, 2016
Apr. 15, 2016
Jan. 22, 2016
Long-term Debt                      
Debt issuance costs $ (122)               $ (119)    
Net unamortized debt premium (discount) (24)   $ (3)       $ (30)   88    
Total long-term debt, including current portion 20,935               23,409    
Long-term debt due within one year (501)               (785)    
Long-term debt 20,434               22,624    
Transcontinental Gas Pipe Line Company, LLC [Member]                      
Long-term Debt                      
Other financing obligation 231 $ 237             0    
Transcontinental Gas Pipe Line Company, LLC [Member] | 6.4% Senior Unsecured Notes due 2016 [Member]                      
Long-term Debt                      
Long-term debt interest rate                   6.40%  
Transcontinental Gas Pipe Line Company, LLC [Member] | 6.05% Senior Unsecured Notes due 2018 [Member]                      
Long-term Debt                      
Long-term debt $ 250               250    
Long-term debt interest rate 6.05%                    
Transcontinental Gas Pipe Line Company, LLC [Member] | 7.08% Debentures due 2026 [Member]                      
Long-term Debt                      
Long-term debt $ 8               8    
Long-term debt interest rate 7.08%                    
Transcontinental Gas Pipe Line Company, LLC [Member] | 7.25% Debentures due 2026 [Member]                      
Long-term Debt                      
Long-term debt $ 200               200    
Long-term debt interest rate 7.25%                    
Transcontinental Gas Pipe Line Company, LLC [Member] | 7.85% Senior Unsecured Notes Due 2026 [Member]                      
Long-term Debt                      
Long-term debt $ 1,000               1,000    
Long-term debt interest rate 7.85%                   7.85%
Transcontinental Gas Pipe Line Company, LLC [Member] | 5.4% Senior Unsecured Notes due 2041 [Member]                      
Long-term Debt                      
Long-term debt $ 375               375    
Long-term debt interest rate 5.40%                    
Transcontinental Gas Pipe Line Company, LLC [Member] | 4.45% Senior Unsecured Notes due 2042 [Member]                      
Long-term Debt                      
Long-term debt $ 400               400    
Long-term debt interest rate 4.45%                    
Northwest Pipeline LLC [Member] | 5.95% Senior Unsecured Notes due 2017 [Member]                      
Long-term Debt                      
Long-term debt $ 0               $ 185    
Long-term debt interest rate         5.95%       5.95%    
Northwest Pipeline LLC [Member] | 6.05% Senior Unsecured Notes due 2018 [Member]                      
Long-term Debt                      
Long-term debt $ 250               $ 250    
Long-term debt interest rate 6.05%                    
Northwest Pipeline LLC [Member] | 7.125% Debentures due 2025 [Member]                      
Long-term Debt                      
Long-term debt $ 85               85    
Long-term debt interest rate 7.125%                    
Northwest Pipeline LLC [Member] | 4% Senior Unsecured Notes Due 2027 [Member]                      
Long-term Debt                      
Long-term debt $ 250               0    
Long-term debt interest rate 4.00%         4.00%          
Williams Partners L.P. [Member]                      
Long-term Debt                      
Credit facility loans [1] $ 0                    
Williams Partners L.P. [Member] | 7.25% Senior Unsecured Notes due 2017 [Member]                      
Long-term Debt                      
Long-term debt 0               $ 600    
Long-term debt interest rate               7.25% 7.25%    
Williams Partners L.P. [Member] | 5.25% Senior Unsecured Notes due 2020 [Member]                      
Long-term Debt                      
Long-term debt $ 1,500               $ 1,500    
Long-term debt interest rate 5.25%                    
Williams Partners L.P. [Member] | 4.125% Senior Unsecured Notes due 2020 [Member]                      
Long-term Debt                      
Long-term debt $ 600               600    
Long-term debt interest rate 4.125%                    
Williams Partners L.P. [Member] | 4% Senior Unsecured Notes due 2021 [Member]                      
Long-term Debt                      
Long-term debt $ 500               500    
Long-term debt interest rate 4.00%                    
Williams Partners L.P. [Member] | 3.6% Senior Unsecured Notes due 2022 [Member]                      
Long-term Debt                      
Long-term debt $ 1,250               1,250    
Long-term debt interest rate 3.60%                    
Williams Partners L.P. [Member] | 3.35% Senior Unsecured Notes due 2022 [Member]                      
Long-term Debt                      
Long-term debt $ 750               750    
Long-term debt interest rate 3.35%                    
Williams Partners L.P. [Member] | 6.125% Senior Unsecured Notes due 2022 [Member]                      
Long-term Debt                      
Long-term debt $ 0               $ 750    
Long-term debt interest rate                 6.125%    
Williams Partners L.P. [Member] | 4.5% Senior Unsecured Notes due 2023 [Member]                      
Long-term Debt                      
Long-term debt $ 600               $ 600    
Long-term debt interest rate 4.50%                    
Williams Partners L.P. [Member] | 4.875% Senior Unsecured Notes due 2023 [Member]                      
Long-term Debt                      
Long-term debt $ 0               $ 1,400    
Long-term debt interest rate                 4.875%    
Williams Partners L.P. [Member] | 4.3% Senior Unsecured Notes Due 2024 [Member]                      
Long-term Debt                      
Long-term debt $ 1,000               $ 1,000    
Long-term debt interest rate 4.30%                    
Williams Partners L.P. [Member] | 4.875% Senior Unsecured Notes due 2024 [Member]                      
Long-term Debt                      
Long-term debt $ 750               750    
Long-term debt interest rate 4.875%                    
Williams Partners L.P. [Member] | 3.9% Senior Unsecured Notes due 2025 [Member]                      
Long-term Debt                      
Long-term debt $ 750               750    
Long-term debt interest rate 3.90%                    
Williams Partners L.P. [Member] | 4% Senior Unsecured Notes due 2025 [Member]                      
Long-term Debt                      
Long-term debt $ 750               750    
Long-term debt interest rate 4.00%                    
Williams Partners L.P. [Member] | 3.75% Senior Unsecured Notes Due 2027 [Member]                      
Long-term Debt                      
Long-term debt interest rate 3.75%                    
Williams Partners L.P. [Member] | 6.3% Senior Unsecured Notes due 2040 [Member]                      
Long-term Debt                      
Long-term debt $ 1,250               1,250    
Long-term debt interest rate 6.30%                    
Williams Partners L.P. [Member] | 5.8% Senior Unsecured Notes due 2043 [Member]                      
Long-term Debt                      
Long-term debt $ 400               400    
Long-term debt interest rate 5.80%                    
Williams Partners L.P. [Member] | 5.4% Senior Unsecured Notes Due 2044 [Member]                      
Long-term Debt                      
Long-term debt $ 500               500    
Long-term debt interest rate 5.40%                    
Williams Partners L.P. [Member] | 4.9% Senior Unsecured Notes due 2045 [Member]                      
Long-term Debt                      
Long-term debt $ 500               500    
Long-term debt interest rate 4.90%                    
Williams Partners L.P. [Member] | 5.1% Senior Unsecured Notes due 2045 [Member]                      
Long-term Debt                      
Long-term debt $ 1,000               1,000    
Long-term debt interest rate 5.10%                    
Williams Partners L.P. [Member] | Variable Interest Term Loan due 2018 [Member]                      
Long-term Debt                      
Long-term debt $ 0               850    
Williams Partners L.P. [Member] | 6.125% Senior Unsecured Notes due 2022 [Member]                      
Long-term Debt                      
Long-term debt interest rate             6.125%        
Williams Partners L.P. [Member] | 4.875% Senior Unsecured Notes due 2023 [Member]                      
Long-term Debt                      
Long-term debt interest rate     4.875%                
Williams Partners L.P. [Member] | 3.75% Senior Unsecured Notes Due 2027 [Member]                      
Long-term Debt                      
Long-term debt 1,450               0    
Long-term debt interest rate       3.75%              
The Williams Companies, Inc. [Member]                      
Long-term Debt                      
Credit facility loans 270               775    
The Williams Companies, Inc. [Member] | 7.875% Senior Unsecured Notes due 2021 [Member]                      
Long-term Debt                      
Long-term debt $ 371               371    
Long-term debt interest rate 7.875%                    
The Williams Companies, Inc. [Member] | 3.7% Senior Unsecured Notes due 2023 [Member]                      
Long-term Debt                      
Long-term debt $ 850               850    
Long-term debt interest rate 3.70%                    
The Williams Companies, Inc. [Member] | 4.55% Senior Unsecured Notes due 2024 [Member]                      
Long-term Debt                      
Long-term debt $ 1,250               1,250    
Long-term debt interest rate 4.55%                    
The Williams Companies, Inc. [Member] | 7.5% Debentures due 2031 [Member]                      
Long-term Debt                      
Long-term debt $ 339               339    
Long-term debt interest rate 7.50%                    
The Williams Companies, Inc. [Member] | 7.75% Senior Unsecured Notes due 2031 [Member]                      
Long-term Debt                      
Long-term debt $ 252               252    
Long-term debt interest rate 7.75%                    
The Williams Companies, Inc. [Member] | 8.75% Senior Unsecured Notes due 2032 [Member]                      
Long-term Debt                      
Long-term debt $ 445               445    
Long-term debt interest rate 8.75%                    
The Williams Companies, Inc. [Member] | 5.75% Senior Unsecured Notes due 2044 [Member]                      
Long-term Debt                      
Long-term debt $ 650               650    
Long-term debt interest rate 5.75%                    
The Williams Companies, Inc. [Member] | Various - 7.625% to 10.25% Senior Unsecured Notes and Debentures due 2019 to 2027 Minimum Interest Rate [Member]                      
Long-term Debt                      
Long-term debt interest rate 7.625%                    
The Williams Companies, Inc. [Member] | Various - 5.5% to 10.25% Senior Unsecured Notes and Debentures due 2019 to 2033 Minimum Interest Rate [Member]                      
Long-term Debt                      
Long-term debt $ 55               $ 55    
The Williams Companies, Inc. [Member] | Various - 7.625% to 10.25% Senior Unsecured Notes and Debentures due 2019 to 2027 Maximum Interest Rate [Member]                      
Long-term Debt                      
Long-term debt interest rate 10.25%                    
[1] In managing our available liquidity, we do not expect a maximum outstanding amount in excess of the capacity of our credit facility inclusive of any outstanding amounts under our commercial paper program.