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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, 2017
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) $ 93.36
Number of Options (in shares) | shares 15
Weighted Average Remaining Contractual Life 4 years 5 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 61.97
Intrinsic Value | $ $ 480
Number of Options (in shares) | shares 7
Weighted Average Remaining Contractual Life 3 years 4 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 51.99
Intrinsic Value | $ $ 300
Closing stock price (in dollars per share) $ 94.09
$ 0.00 - $ 34.33  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) 0
Exercise price range upper limit (in dollars per share) $ 34.33
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 1 year 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 30.05
Intrinsic Value | $ $ 81
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 1 year 4 months 24 days
Weighted Average Exercise Price (in dollars per share) $ 30.05
Intrinsic Value | $ $ 81
$ 34.34 - $ 48.75  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 34.34
Exercise price range upper limit (in dollars per share) $ 48.75
Number of Options (in shares) | shares 2
Weighted Average Remaining Contractual Life 2 years 9 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 48.75
Intrinsic Value | $ $ 100
Number of Options (in shares) | shares 2
Weighted Average Remaining Contractual Life 2 years 9 months 4 days
Weighted Average Exercise Price (in dollars per share) $ 48.75
Intrinsic Value | $ $ 100
$ 48.76 - $ 59.91  
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 3 years 9 months 22 days
Weighted Average Exercise Price (in dollars per share) $ 58.19
Intrinsic Value | $ $ 93
Number of Options (in shares) | shares 2
Weighted Average Remaining Contractual Life 3 years 9 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 58.17
Intrinsic Value | $ $ 63
$ 59.92 - $ 62.92  
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 3
Weighted Average Remaining Contractual Life 5 years 2 months 16 days
Weighted Average Exercise Price (in dollars per share) $ 62.92
Intrinsic Value | $ $ 94
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 5 years 2 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 62.92
Intrinsic Value | $ $ 30
$ 62.93 - $ 66.62  
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) $ 66.62
Number of Options (in shares) | shares 2
Weighted Average Remaining Contractual Life 4 years 8 months 16 days
Weighted Average Exercise Price (in dollars per share) $ 65.78
Intrinsic Value | $ $ 59
Number of Options (in shares) | shares 1
Weighted Average Remaining Contractual Life 4 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 65.52
Intrinsic Value | $ $ 25
$ 66.63 - $ 93.36  
Stock options outstanding and exercisable  
Exercise price range lower limit (in dollars per share) $ 66.63
Exercise price range upper limit (in dollars per share) $ 93.36
Number of Options (in shares) | shares 4
Weighted Average Remaining Contractual Life 6 years 1 month 21 days
Weighted Average Exercise Price (in dollars per share) $ 80.03
Intrinsic Value | $ $ 53
Number of Options (in shares) | shares 0
Weighted Average Remaining Contractual Life 3 years 10 months 13 days
Weighted Average Exercise Price (in dollars per share) $ 79.41
Intrinsic Value | $ $ 1