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Total Equity (Dividends and Share Repurchases) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Repurchase Program                      
Repurchases of common stock   $ 1,250       $ 2     $ 3,750 $ 3,500  
Capital Plans                      
Dividends declared per common share $ 0.25 $ 0.25 $ 0.2 $ 0.2 $ 0.2 $ 0.2 $ 0.15 $ 0.15 $ 0.9 $ 0.7 $ 0.55
2017 Capital Plan                      
Capital Plans                      
Authorized repurchase amount of outstanding common stock $ 5,000               $ 5,000    
Stock repurchase program start date                 Jul. 01, 2017    
Stock repurchase program expiration date                 Jun. 30, 2018    
Dividends declared per common share $ 0.25 $ 0.25                  
2016 Capital Plan                      
Capital Plans                      
Authorized repurchase amount of outstanding common stock $ 3,500               $ 3,500