Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets
Derivative assets	$ 147	$ 200
Liabilities
Derivative liabilities	43	81
Level 1 | Fair Value, Measurements, Recurring
Assets
Derivative assets	0	0
Investments and securities	24	21
Total	24	21
Liabilities
Derivative liabilities	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets
Derivative assets	147	200
Investments and securities	0	0
Total	147	200
Liabilities
Derivative liabilities	43	81
Level 3 | Fair Value, Measurements, Recurring
Assets
Derivative assets	0	0
Investments and securities	27	47
Total	27	47
Liabilities
Derivative liabilities	$ 0	$ 0