Accumulated Other Comprehensive Income (Loss) - After-tax Changes by Component (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (157)	$ (4,220)
Amounts arising during the period	0	273
Reclassifications from AOCI	5	65
Net OCI during the period	5	338
Balance at end of period	(152)	(3,882)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	(1,158)
Amounts arising during the period	0	303
Reclassifications from AOCI	0	0
Net OCI during the period	0	303
Balance at end of period	0	(855)
Unrealized gains (losses) on qualifying derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	1	0
Amounts arising during the period	0	(30)
Reclassifications from AOCI	1	25
Net OCI during the period	1	(5)
Balance at end of period	2	(5)
Defined benefit plans Prior service costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(6)	(16)
Amounts arising during the period	(1)	0
Reclassifications from AOCI	1	0
Net OCI during the period	0	0
Balance at end of period	(6)	(16)
Defined benefit plans Actuarial gain (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(152)	(3,046)
Amounts arising during the period	0	0
Reclassifications from AOCI	3	40
Net OCI during the period	3	40
Balance at end of period	(149)	(3,006)
Equity Investees' OCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	0
Amounts arising during the period	1	0
Reclassifications from AOCI	0	0
Net OCI during the period	1	0
Balance at end of period	$ 1	$ 0