XML 67 R35.htm IDEA: XBRL DOCUMENT v3.8.0.1
Introduction - ASC 606 (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) $ 1,607 $ 1,530  
Other revenues 413 141  
Other operations and maintenance 1,451 1,383  
Operating income 1,376 1,252  
Other income (expense), net 60 48  
Earnings before income taxes 1,049 980  
Income taxes 113 315  
Net income 936 665  
Consolidated net income attributable to Southern Company $ 938 $ 658  
Basic earnings per share (in dollars per share) $ 0.93 $ 0.66  
Diluted earnings per share (in dollars per share) $ 0.92 $ 0.66  
Condensed Consolidated Statements of Cash Flow      
Net income $ 936 $ 665  
Changes in certain current assets and liabilities:      
Receivables 197 310  
Other current assets 7 (31)  
Accrued taxes (79) (212)  
Other current liabilities 81 (48)  
Condensed Balance Sheet      
Unbilled revenues 777   $ 810
Other accounts and notes receivable 703   698
Other current assets 286   211
Accrued taxes 368   636
Other current liabilities 923   874
Retained earnings 9,257   8,885
Balances Without Adoption of ASC 606      
Condensed Statements of Income      
Net income $ 926    
Basic earnings per share (in dollars per share) $ 0.92    
Diluted earnings per share (in dollars per share) $ 0.91    
Condensed Consolidated Statements of Cash Flow      
Net income $ 926    
Changes in certain current assets and liabilities:      
Receivables 211    
Other current assets 7    
Accrued taxes (75)    
Other current liabilities 67    
Condensed Balance Sheet      
Unbilled revenues 822    
Other accounts and notes receivable 709    
Other current assets 235    
Accrued taxes 364    
Other current liabilities 937    
Retained earnings 9,247    
ALABAMA POWER CO      
Condensed Statements of Income      
Other revenues 63 56  
Other operations and maintenance 387 384  
Operating income 372 361  
Other income (expense), net 5 10  
Earnings before income taxes 311 304  
Income taxes 82 126  
Net income 229 178  
Consolidated net income attributable to Southern Company 225 174  
Condensed Consolidated Statements of Cash Flow      
Net income 229 178  
Changes in certain current assets and liabilities:      
Other current assets 19 39  
Accrued taxes 57 77  
Other current liabilities 45 (9)  
Condensed Balance Sheet      
Unbilled revenues 131   162
Other accounts and notes receivable 36   55
Other current assets 3   5
Accrued taxes 77   54
Other current liabilities 57   56
Retained earnings 2,670   2,647
ALABAMA POWER CO | Balances Without Adoption of ASC 606      
Condensed Statements of Income      
Other revenues 55    
Other operations and maintenance 377    
Operating income 374    
Other income (expense), net 3    
GEORGIA POWER CO      
Condensed Statements of Income      
Other revenues 109 96  
Other operations and maintenance 408 399  
Operating income 513 483  
Other income (expense), net 38 38  
Earnings before income taxes 445 420  
Income taxes 93 156  
Net income 352 264  
Consolidated net income attributable to Southern Company 352 260  
Condensed Consolidated Statements of Cash Flow      
Net income 352 264  
Changes in certain current assets and liabilities:      
Receivables 135 142  
Other current assets 9 (16)  
Accrued taxes (191) (235)  
Other current liabilities (3) 2  
Condensed Balance Sheet      
Unbilled revenues 189   255
Other accounts and notes receivable 77   76
Other current assets 39   14
Other current liabilities 215   198
Retained earnings 4,228   4,215
Accrued income taxes 129   344
GEORGIA POWER CO | Balances Without Adoption of ASC 606      
Condensed Statements of Income      
Other revenues 94    
Other operations and maintenance 394    
Operating income 512    
Other income (expense), net 39    
Changes in certain current assets and liabilities:      
Receivables 145    
Other current assets (1)    
Condensed Balance Sheet      
Unbilled revenues 202    
Other accounts and notes receivable 83    
Other current assets 20    
SOUTHERN Co GAS      
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) 1,631 1,521  
Other revenues 32 30  
Other operations and maintenance 276 255  
Operating income 388 389  
Other income (expense), net 12 7  
Earnings before income taxes 383 389  
Income taxes 104 150  
Net income 279 239  
Consolidated net income attributable to Southern Company 279 239  
Condensed Consolidated Statements of Cash Flow      
Net income 279 239  
Changes in certain current assets and liabilities:      
Receivables 175 115  
Other current assets 14 19  
Accrued taxes 28 19  
Other current liabilities 48 49  
Condensed Balance Sheet      
Unbilled revenues 210   285
Other accounts and notes receivable 51   103
Other current assets 51   78
Accrued taxes 76   78
Other current liabilities 143   159
Retained earnings (55)   (212)
Accrued income taxes 77   $ 40
SOUTHERN Co GAS | Balances Without Adoption of ASC 606      
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) 1,617    
Operating income 374    
Earnings before income taxes 369    
Income taxes 100    
Net income 269    
Condensed Consolidated Statements of Cash Flow      
Net income 269    
Changes in certain current assets and liabilities:      
Accrued taxes 32    
Other current liabilities 34    
Condensed Balance Sheet      
Other current liabilities 157    
Retained earnings (65)    
Accrued income taxes 73    
Operating Segments | SOUTHERN Co GAS      
Condensed Statements of Income      
Consolidated net income attributable to Southern Company 289 $ 231  
SOUTHERN Co GAS | Operating Segments | SOUTHERN Co GAS      
Condensed Statements of Income      
Consolidated net income attributable to Southern Company 279    
Southern Company      
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) 1,607    
Other revenues 413    
Southern Company | Balances Without Adoption of ASC 606      
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) 1,593    
Other revenues 412    
Other operations and maintenance 1,441    
Operating income 1,371    
Other income (expense), net 51    
Earnings before income taxes 1,035    
Income taxes 109    
Net income 926    
Consolidated net income attributable to Southern Company 928    
Condensed Consolidated Statements of Cash Flow      
Net income 926    
Accounting Standards Update 2014-09 | Effect of Change      
Condensed Statements of Income      
Net income $ 10    
Basic earnings per share (in dollars per share) $ 0.01    
Diluted earnings per share (in dollars per share) $ 0.01    
Condensed Consolidated Statements of Cash Flow      
Net income $ 10    
Changes in certain current assets and liabilities:      
Receivables (14)    
Other current assets (14)    
Accrued taxes (4)    
Other current liabilities 14    
Condensed Balance Sheet      
Unbilled revenues (45)    
Other accounts and notes receivable (6)    
Other current assets 51    
Accrued taxes 4    
Other current liabilities (14)    
Retained earnings 10    
Accounting Standards Update 2014-09 | ALABAMA POWER CO | Effect of Change      
Condensed Statements of Income      
Other revenues 8    
Other operations and maintenance 10    
Operating income (2)    
Other income (expense), net 2    
Accounting Standards Update 2014-09 | GEORGIA POWER CO | Effect of Change      
Condensed Statements of Income      
Other revenues 15    
Other operations and maintenance 14    
Operating income 1    
Other income (expense), net (1)    
Changes in certain current assets and liabilities:      
Receivables (10)    
Other current assets 10    
Condensed Balance Sheet      
Unbilled revenues (13)    
Other accounts and notes receivable (6)    
Other current assets 19    
Accounting Standards Update 2014-09 | SOUTHERN Co GAS | Effect of Change      
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) 14    
Operating income 14    
Earnings before income taxes 14    
Income taxes 4    
Net income 10    
Condensed Consolidated Statements of Cash Flow      
Net income 10    
Changes in certain current assets and liabilities:      
Accrued taxes (4)    
Other current liabilities 14    
Condensed Balance Sheet      
Other current liabilities (14)    
Retained earnings 10    
Accrued income taxes 4    
Accounting Standards Update 2014-09 | Southern Company | Effect of Change      
Condensed Statements of Income      
Natural gas revenues (includes alternative revenue programs of $(24) and $9, respectively) 14    
Other revenues 1    
Other operations and maintenance 10    
Operating income 5    
Other income (expense), net 9    
Earnings before income taxes 14    
Income taxes 4    
Net income 10    
Consolidated net income attributable to Southern Company 10    
Condensed Consolidated Statements of Cash Flow      
Net income $ 10