XML 98 R85.htm IDEA: XBRL DOCUMENT v3.5.0.2
Fair value measurements - Significant unobservable inputs (Detail) - Significant Unobservable Inputs (Level 3) [Member] - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Net Derivative Contract Liabilities [Member]    
Fair Value Measurements Significant Unobservable Inputs [Line Items]    
Beginning Balance $ (3,785) $ (4,759)
Gains (losses) included in earnings (221) 467
Gains (losses) included in other comprehensive income (2) (5)
Gains (losses) included in regulatory assets and liabilities (12) (21)
Acquisitions, dispositions and settlements (81) (65)
Transfers into/out of Level 3 195 3
Ending Balance (3,906) (4,380)
Fixed Maturities [Member]    
Fair Value Measurements Significant Unobservable Inputs [Line Items]    
Beginning Balance 100 8
Gains (losses) included in other comprehensive income 3  
Acquisitions, dispositions and settlements 5 103
Transfers into/out of Level 3 (1)  
Ending Balance 107 111
Equity Securities and Other Investments [Member]    
Fair Value Measurements Significant Unobservable Inputs [Line Items]    
Beginning Balance 21,403 21,996
Gains (losses) included in earnings 2,409  
Gains (losses) included in other comprehensive income (2,233) (1,722)
Acquisitions, dispositions and settlements (4,461)  
Ending Balance $ 17,118 $ 20,274