XML 151 R132.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Schedule of Reconciliation of Change in Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gross Unrecognized Tax Benefits      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 85 $ 130 $ 107
Additions for tax positions related to prior years 5 0 38
Reductions for tax positions related to prior years due to IRS and other settlements (4) (45) (15)
Ending balance 86 85 130
Portion of balance at December 31, that, if recognized, would impact the effective income tax rate 68    
Accrued Interest and Penalties      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 24 33 36
Additions for tax positions related to prior years 7 6 8
Reductions for tax positions related to prior years due to IRS and other settlements (2) (15) (11)
Ending balance 29 24 33
Portion of balance at December 31, that, if recognized, would impact the effective income tax rate 23    
Gross Tax, Interest and Penalties      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 109 163 143
Additions for tax positions related to prior years 12 6 46
Reductions for tax positions related to prior years due to IRS and other settlements (6) (60) (26)
Ending balance 115 $ 109 $ 163
Portion of balance at December 31, that, if recognized, would impact the effective income tax rate $ 91