Other Comprehensive Earnings/Losses (Reclassifications) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit income, excluding service cost	$ (24)	$ (21)	$ (40)	$ (37)
ABI	(333)	(189)	(866)	(759)
Pre-tax amounts reclassified from accumulated other comprehensive losses to net earnings (losses)	2,602	(1,944)	(516)	(5,716)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
ABI	(4)	(21)	(35)	(41)
Pre-tax amounts reclassified from accumulated other comprehensive losses to net earnings (losses)	31	29	78	127
Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit income, excluding service cost	35	50	113	168
Net loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit income, excluding service cost	42	59	135	196
Prior service cost/credit [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic benefit income, excluding service cost	$ (7)	$ (9)	$ (22)	$ (28)