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Stockholders' Equity 2 (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2018
Nov. 20, 2015
Nov. 16, 2015
Dec. 08, 2015
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Nov. 13, 2015
May 14, 2014
Equity [Abstract]                                  
Accumulated other comprehensive loss $ (290,000,000)       $ (290,000,000)       $ (483,000,000)       $ (290,000,000) $ (483,000,000) $ (416,000,000)    
Rights Plan, Stockholder Protection Rights Agreement effective date                         Nov. 30, 2015        
Rights Plan, Beneficial ownership percentage with grandfathered exclusion, Minimum                         20.00%        
Rights Plan, Grandfathered shares percentage, Maximum                         25.00%        
Rights Plan, Flip-in Trigger                         A “Flip-in” Trigger will occur upon the earlier of (i) a public announcement by the Company that any person has become an Acquiring Person or (ii) an Acquiring Person acquires more than 50% of the Company’s outstanding shares of common stock.        
Rights Plan, Purchase price                         $ 120        
Rights Plan, Shares                         0.001        
Rights Plan, Exercise price                         $ 120        
Rights Plan, Redemption price per Right                         $ 0.001        
Rights Plan, Qualified Offer                         10.00%        
Rights Plan, Minimum tender condition                         50.00%        
Rights Plan, Rights expiration date                         Nov. 30, 2018        
Stock Repurchase Program [Line Items]                                  
Value of common stock repurchased                         $ 163,000,000 100,000,000 707,000,000    
Dividend per share (in dollars per share) paid reducing purchase price         $ 0.255 $ 0.255 $ 0.255 $ 0.255 $ 0.255 $ 0.255 $ 0.255 $ 0.255          
Payments for repurchases of common stock                         $ 163,000,000 $ 100,000,000 $ 707,000,000    
Careal                                  
Stock Repurchase Program [Line Items]                                  
Shareholder ownership percentage of total company stock outstanding     28.70%                            
Careal and its Shareholders Collectively                                  
Stock Repurchase Program [Line Items]                                  
Shareholder ownership percentage of total company stock outstanding 25.20%                                
Current Stock Repurchase Program                                  
Stock Repurchase Program [Line Items]                                  
Stock repurchase program, Authorized amount                               $ 750,000,000  
Shares of common stock repurchased                         5,000,000 3,100,000      
Value of common stock repurchased                         $ 163,000,000 $ 100,000,000      
Stock repurchase program, Remaining authorized common stock repurchase amount $ 487,000,000       $ 487,000,000               $ 487,000,000        
Prior Stock Repurchase Program                                  
Stock Repurchase Program [Line Items]                                  
Stock repurchase program, Authorized amount                                 $ 1,000,000,000
Shares of common stock repurchased                             26,000,000    
Value of common stock repurchased                             $ 707,000,000    
Stock repurchase program, Remaining authorized common stock repurchase amount   $ 0                              
Prior Stock Repurchase Program | Careal Share Repurchase Arrangement                                  
Stock Repurchase Program [Line Items]                                  
Shares of common stock repurchased   22,000,000                              
Effective share repurchase price (in dollars per share)   $ 26.81                              
Discount to weighted average price of company stock   3.00%                              
Dividend per share (in dollars per share) paid reducing purchase price       $ 0.25                          
Payments for repurchases of common stock       $ 590,000,000