Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Net cash paid for capitalized interest | $ 25 | $ 30 |
| Alabama Power [Member] | ||
| Net cash paid for capitalized interest | 3 | 4 |
| Georgia Power [Member] | ||
| Net cash paid for capitalized interest | 5 | 5 |
| Gulf Power [Member] | ||
| Net cash paid for capitalized interest | 0 | 0 |
| Mississippi Power [Member] | ||
| Interest paid | 25 | 22 |
| Net cash paid for capitalized interest | 12 | 10 |
| Southern Power [Member] | ||
| Net cash paid for capitalized interest | 2 | 10 |
| Southern Company Gas [Member] | ||
| Net cash paid for capitalized interest | $ 3 | |
| Predecessor [Member] | Southern Company Gas [Member] | ||
| Net cash paid for capitalized interest | $ 1 | |