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Employee Benefits and Stock-Based Compensation - Restricted Stock and Units (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
year
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
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 | $ $ 80 $ 106 $ 72
Unamortized compensation expense | $ $ 77    
Weighted average period over which unamortized compensation cost will be recognized (in years) 2 years 5 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Nonvested, Beginning balance (in shares) | shares 3,753,933 3,218,737 2,924,350
Stock and units granted (in shares) | shares 1,547,229 2,087,942 1,650,772
Lapse of restrictions (in shares) | shares (1,342,027) (1,194,519) (1,150,080)
Stock and units forfeited (in shares) | shares (254,712) (358,227) (206,305)
Nonvested, Ending balance (in shares) | shares 3,704,423 3,753,933 3,218,737
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 $ 42.09 $ 32.95 $ 22.77
Stock and units granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 51.45 50.60 43.48
Lapse of restrictions, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 36.95 31.70 22.92
Stock and units forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 47.45 44.25 27.14
Nonvested, Ending balance, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 47.49 $ 42.09 $ 32.95
Total fair value of restricted stock and restricted stock units whose restriction lapsed | $ $ 61 $ 38 $ 27
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    
Fair value of units and shares awarded | $ $ 26 $ 38 $ 24
Unamortized compensation expense | $ $ 32    
Weighted average period over which unamortized compensation cost will be recognized (in years) 1 year 7 months 2 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Nonvested, Beginning balance (in shares) | shares 1,228,465 567,881 0
Stock and units granted (in shares) | shares 498,184 713,657 605,111
Lapse of restrictions (in shares) | shares (297,940) 0 (1,750)
Stock and units forfeited (in shares) | shares (97,298) (53,073) (35,480)
Nonvested, Ending balance (in shares) | shares 1,331,411 1,228,465 567,881
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 $ 47.31 $ 39.31 $ 0.00
Stock and units granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 52.84 53.82 39.30
Lapse of restrictions, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 39.43 0.00 39.14
Stock and units forfeited, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares 52.02 49.25 39.14
Nonvested, Ending balance, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 50.80 $ 47.31 $ 39.31
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%