Income Taxes - Income from continuing operations before income tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income (loss) before income taxes:
Income before income taxes	$ 1,931	$ 2,466	$ 1,870
Current:
Total current tax expense	612	439	333
Deferred tax expense (benefit):
Total deferred tax expense (benefit)	11	9	(36)
Total income tax expense	623	448	297
Ireland
Income (loss) before income taxes:
Income before income taxes	15	(86)	200
Current:
Total current tax expense	2	2	1
Deferred tax expense (benefit):
Total deferred tax expense (benefit)	(1)	(1)	(1)
U.K.
Income (loss) before income taxes:
Income before income taxes	549	634	228
Current:
Total current tax expense	50	30	20
Deferred tax expense (benefit):
Total deferred tax expense (benefit)	131	39	35
U.S. federal
Income (loss) before income taxes:
Income before income taxes	(818)	(28)	(220)
Current:
Total current tax expense	197	126	22
Deferred tax expense (benefit):
Total deferred tax expense (benefit)	(83)	(72)	(20)
U.S. state and local
Current:
Total current tax expense	72	22	41
Deferred tax expense (benefit):
Total deferred tax expense (benefit)	(30)	(4)	(27)
Other
Income (loss) before income taxes:
Income before income taxes	2,185	1,946	1,662
Current:
Total current tax expense	291	259	249
Deferred tax expense (benefit):
Total deferred tax expense (benefit)	$ (6)	$ 47	$ (23)