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Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (11,788) $ (9,519) $ (10,149) $ (9,333)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation (1,445) 530    
Amounts reclassified, pretax - Foreign Currency Translation 0 1    
Tax benefit (expense) - Foreign Currency Translation 9 (13)    
ASU 2018-02 adoption impact - Foreign Currency Translation   (8)    
Other comprehensive (loss) income before reclassifications, net - Pension 8 (1)    
Amounts reclassified, pretax - Pension 102 44    
Tax benefit (expense) - Pension (31) (10)    
ASU 2018-02 adoption impact - Pension   (737)    
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains (403) 7    
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains 29 4    
Tax benefit (expense) - Unrealized Hedging (Losses) Gains 92 (3)    
ASU 2018-02 adoption impact - Unrealized Hedging (Losses) Gains   0    
Other comprehensive (loss) income before reclassifications, net (1,840) 536    
Amounts reclassified, pre-tax 131 49    
Tax benefit (expense) 70 (26)    
ASU 2018-02 adoption impact   (745)    
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (4,647) (2,932) (3,211) (3,442)
Defined Benefit Pension and Post-retirement Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (6,693) (6,422) (6,772) (5,718)
Unrealized hedging (losses) gains        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (448) $ (165) $ (166) $ (173)