Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 18,163	$ 34,414	$ 34,876
Other comprehensive income (loss) before reclassifications	(220)	(10)
Amounts reclassified from accumulated other comprehensive loss	70	48
Deferred taxes	(1)	6
Other comprehensive income (loss)	(151)	44	(8)
Less: Other comprehensive loss attributable to noncontrolling interests	(2)	(3)	0
Ending balance	16,726	18,163	34,414
Investment Securities, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0	2
Ending balance	0	0	2
Investment Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	0	(2)
Amounts reclassified from accumulated other comprehensive loss	0	0
Deferred taxes	0	0
Other comprehensive income (loss)	0	(2)
Investment Securities, Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Other comprehensive loss attributable to noncontrolling interests	0	0
Foreign Currency Translation Adjustment, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,096)	(2,274)
Ending balance	(2,398)	(2,096)	(2,274)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	(344)	175
Amounts reclassified from accumulated other comprehensive loss	39	0
Deferred taxes	0	0
Other comprehensive income (loss)	(305)	175
Foreign Currency Translation Adjustment, Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Other comprehensive loss attributable to noncontrolling interests	(2)	(3)
Cash Flow Hedges, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	5	10
Ending balance	(12)	5	10
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	(11)	(2)
Amounts reclassified from accumulated other comprehensive loss	(7)	(4)
Deferred taxes	2	1
Other comprehensive income (loss)	(16)	(5)
Cash Flow Hedges, Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Other comprehensive loss attributable to noncontrolling interests	0	0
Benefit Plans, Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(451)	(327)
Ending balance	(281)	(451)	(327)
Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	135	(181)
Amounts reclassified from accumulated other comprehensive loss	38	52
Deferred taxes	(3)	5
Other comprehensive income (loss)	170	(124)
Benefit Plans, Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Less: Other comprehensive loss attributable to noncontrolling interests	0	0
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,542)	(2,589)	(2,462)
Other comprehensive income (loss)	(149)	47	(8)
Ending balance	$ (2,691)	$ (2,542)	$ (2,589)