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Employee Benefit Benefits and Stock-Based Compensation - Restricted Stock and Units (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
year
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Restricted Stock Units and Shares      
Share-based Compensation Arrangement by Share-based Payment Award      
Restrictions on transfer lapse, minimum (in years) | year 1    
Restrictions on transfer lapse, maximum (in years) | year 4    
Fair value of units and shares awarded | $ $ 144 $ 96 $ 34
Unamortized compensation expense | $ $ 109    
Weighted average period over which unamortized compensation cost will be recognized (in years) 2 years 2 months 1 day    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Nonvested, Beginning balance (in shares) | shares 3,218,737 2,924,350 3,636,976
Stock and units granted (in shares) | shares 2,087,942 1,650,772 1,617,592
Lapse of restrictions (in shares) | shares (1,194,519) (1,150,080) (1,841,757)
Stock and units forfeited (in shares) | shares (358,227) (206,305) (488,461)
Nonvested, Ending balance (in shares) | shares 3,753,933 3,218,737 2,924,350
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Nonvested, Beginning balance, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 32.95 $ 22.77 $ 24.71
Stock and units granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 50.60 43.48 21.26
Lapse of restrictions, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 31.70 22.92 25.19
Stock and units forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 44.25 27.14 23.10
Nonvested, Ending balance, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 42.09 $ 32.95 $ 22.77
Total fair value of restricted stock and restricted stock units whose restriction lapsed | $ $ 38 $ 27 $ 46
Performance Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Life of Award 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Nonvested, Beginning balance (in shares) | shares 567,881 0  
Stock and units granted (in shares) | shares 713,657 605,111  
Lapse of restrictions (in shares) | shares 0 (1,750)  
Stock and units forfeited (in shares) | shares (53,073) (35,480)  
Nonvested, Ending balance (in shares) | shares 1,228,465 567,881 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Nonvested, Beginning balance, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 39.31 $ 0.00  
Stock and units granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 53.82 39.30  
Lapse of restrictions, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 0.00 39.14  
Stock and units forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 49.25 39.14  
Nonvested, Ending balance, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 47.31 $ 39.31 $ 0.00
second anniversary of grant date [Member] | Performance Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
third anniversary of grant date [Member] | Performance Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
Minimum [Member] | Performance Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
share based compensation arrangement by share-based payment award, achievement level percent 50.00%    
Maximum [Member] | Performance Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
share based compensation arrangement by share-based payment award, achievement level percent 200.00%