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Equity - Shareholders' Equity (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Common Stock and Treasury Stock [Roll Forward]      
Balance January 1 (in shares) 3,577,103,522    
Balance December 31 (in shares) 3,577,103,522 3,577,103,522  
Common Stock      
Movement in Common Stock and Treasury Stock [Roll Forward]      
Balance January 1 (in shares) 3,577,000,000 3,577,000,000 3,577,000,000
Purchases of treasury stock (in shares) 0 0 0
Issuances (in shares) 0 0 0
Balance December 31 (in shares) 3,577,000,000 3,577,000,000 3,577,000,000
Treasury Stock      
Movement in Common Stock and Treasury Stock [Roll Forward]      
Balance January 1 (in shares) 828,000,000 796,000,000 739,000,000
Purchases of treasury stock (in shares) 67,000,000 60,000,000 75,000,000
Issuances (in shares) (15,000,000) (28,000,000) (18,000,000)
Balance December 31 (in shares) 880,000,000 828,000,000 796,000,000