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Capital Structure - Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended 15 Months Ended
Feb. 15, 2018
Feb. 01, 2018
Jan. 19, 2018
Jan. 01, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2015
Employee Stock Purchase Plan and 2013 Capital Allocation Plan                                          
Dividends paid per share (in usd per share)         $ 0.030 $ 0.030 $ 0.030 $ 0.030 $ 0.030 $ 0.030 $ 0.030 $ 0.145 $ 0.145 $ 0.145 $ 0.145 $ 0.145       $ 0.145  
Common stock dividends, proposed annual percentage decrease                 79.00%                   79.00%    
Dividends Per Common Share (in usd per share)                                   $ 0.12 $ 0.24 0.58  
Eligible compensation (as a percent)                                   10.00%      
Exercise price as a percentage of fair value (as a percent)                                   85.00%      
Treasury stock reserved for issuance under the ESPP (in shares)         3,107,050                         3,107,050      
Commissions per share (in usd per share)                                         $ 0.015
Scenario, Plan                                          
Employee Stock Purchase Plan and 2013 Capital Allocation Plan                                          
Common stock, dividends, proposed annual amount, per share                                     $ 0.0012 $ 0.58  
Subsequent Event                                          
Employee Stock Purchase Plan and 2013 Capital Allocation Plan                                          
Dividends Payable, Date Declared     Jan. 19, 2018                                    
Dividends Per Common Share (in usd per share)     $ 0.00030                                    
Dividends payable, date to be paid Feb. 15, 2018                                        
Dividends payable, date of record   Feb. 01, 2018                                      
Common stock issued to employee from treasury stock (in shares)       175,862                                  
Subsequent Event | Scenario, Plan                                          
Employee Stock Purchase Plan and 2013 Capital Allocation Plan                                          
Common stock, dividends, proposed annual amount, per share $ 0.0012                                        
Long-term incentive plans                                          
Employee Stock Purchase Plan and 2013 Capital Allocation Plan                                          
Common Stock, Capital Shares Reserved for Future Issuance         19,597,433                         19,597,433      
Capital Allocation Plan                                          
Employee Stock Purchase Plan and 2013 Capital Allocation Plan                                          
Stock repurchase program, authorized amount                         $ 481             $ 481 $ 481
Total number of shares purchased (in shares)                         5,558,920 11,104,184 4,379,907 3,146,484 1,624,360       25,813,855
Average price paid per share (in usd per share) [1]                         $ 15.03 $ 15.06 $ 24.53 $ 25.15 $ 26.95        
Amounts paid for shares purchased                         $ 84 $ 167 $ 107 $ 79 $ 44       $ 481
[1] The average price paid per share and amounts paid for shares purchased exclude the commissions of $0.015 per share paid in connection with the share repurchase.