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Information Relating to the Consolidated Statement of Cash Flows - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]        
Share repurchase price     $ 1,539,000,000 $ 1,000,000
Stock repurchased during period (in shares)     13,000,000.0 0
Stock repurchased during period     $ 1,537,000,000 $ 0
Dividends paid (in dollars per share) $ 1.19 $ 1.12 $ 2.38 $ 2.24