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Employee Benefit Plans (Schedule of Stock Options Outstanding and Exercisable) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 0
Exercise price range upper limit (in dollars per share) $ 79.41
Number of Options (in shares) | shares 17
Weighted Average Remaining Contractual Life 4 years 5 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 53.21
Intrinsic Value | $ $ 377
Number of Options (in shares) | shares 8
Weighted Average Remaining Contractual Life 2 years 10 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 41.74
Intrinsic Value | $ $ 265
Closing stock price (in dollars per share) $ 75.64
Range of Exercise Price - $ 0.00 - $25.66 [Member]  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) 0
Exercise price range upper limit (in dollars per share) $ 25.66
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 1 year 9 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 24.71
Intrinsic Value | $ $ 73
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 1 year 9 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 24.71
Intrinsic Value | $ $ 73
Range of Exercise Price - $25.67 - $27.40 [Member]  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 25.67
Exercise price range upper limit (in dollars per share) $ 27.40
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 9 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 27.11
Intrinsic Value | $ $ 58
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 9 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 27.11
Intrinsic Value | $ $ 58
Range of Exercise Price - $27.41 - $48.75 [Member]  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 27.41
Exercise price range upper limit (in dollars per share) $ 48.75
Number of Options (in shares) | shares 4
Weighted Average Remaining Contractual Life 3 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 45.21
Intrinsic Value | $ $ 108
Number of Options (in shares) | shares 4
Weighted Average Remaining Contractual Life 3 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 45.21
Intrinsic Value | $ $ 108
Range of Exercise Price - $48.76 - $59.91 [Member]  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 48.76
Exercise price range upper limit (in dollars per share) $ 59.91
Number of Options (in shares) | shares 3
Weighted Average Remaining Contractual Life 4 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 58.19
Intrinsic Value | $ $ 53
Number of Options (in shares) | shares 2
Weighted Average Remaining Contractual Life 4 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 58.15
Intrinsic Value | $ $ 20
Range of Exercise Price - $59.92 - $62.92 [Member]  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 59.92
Exercise price range upper limit (in dollars per share) $ 62.92
Number of Options (in shares) | shares 4
Weighted Average Remaining Contractual Life 6 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share) $ 62.92
Intrinsic Value | $ $ 51
Number of Options (in shares) | shares 0
Weighted Average Remaining Contractual Life 3 years
Weighted Average Exercise Price (in dollars per share) $ 62.92
Intrinsic Value | $ $ 2
Range of Exercise Price - $62.93 - $79.41 [Member]  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 62.93
Exercise price range upper limit (in dollars per share) $ 79.41
Number of Options (in shares) | shares 4
Weighted Average Remaining Contractual Life 5 years 6 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 66.17
Intrinsic Value | $ $ 34
Number of Options (in shares) | shares 0
Weighted Average Remaining Contractual Life 3 years 11 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 64.82
Intrinsic Value | $ $ 4