Other Comprehensive Income (Loss) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019		Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Total comprehensive earnings, net of tax	$ 519	$ 773	$ 874	[1]	$ 836	$ 1,292	$ 1,710	[1]

[1] Certain prior year data has been reclassified to conform to the current presentation.