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Segment Information (Reconciliation of Total Segment Income from Operations to Consolidated Income before Income Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting [Abstract]    
Income from operations $ 346 $ 136
Interest expense (33) (31)
Other income (expense), net 12 11
Income before income taxes $ 325 $ 116