XML 45 R33.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements (Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs (Level 3)) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 313 $ 190
Estimated fair value due in one year or less 128 107
Estimated fair value due after one year through three years $ 148 $ 144