XML 105 R91.htm IDEA: XBRL DOCUMENT v3.7.0.1
Fair Value Measurements - Nonrecurring Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
reporting_unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of reporting units | reporting_unit     3
Number of reporting units impaired | reporting_unit     2
Impairment expense | $ $ 0   $ 129
Midstream      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment expense | $   $ 1 $ 129
Midstream | Goodwill | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate     10.50%
Midstream | Goodwill | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate     11.50%