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Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]    
Unrealized gains (losses) on marketable securities $ 6 $ 3
Deferred gains (losses) on cash flow hedges 139 55
Unrecognized gains (losses) on employee benefit obligations 265 325
Cumulative translation adjustments 637 (751)
Accumulated other comprehensive income (loss), net of deferred taxes $ 1,047 $ (368)