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Equity (Aggregate Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]      
Cash consideration $ 504 $ 5,320 $ 5,435
New Authorization [Member]      
Equity, Class of Treasury Stock [Line Items]      
Cash consideration $ 0 $ 5,000 $ 5,000
Shares repurchased (in shares) 0 140 131