Fair Value Disclosures - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets
Derivative assets	$ 142	$ 200
Liabilities
Derivative liabilities	39	81
Level 1 | Fair Value, Measurements, Recurring
Assets
Derivative assets	0	0
Investments and securities	19	21
Total	19	21
Liabilities
Derivative liabilities	0	0
Level 2 | Fair Value, Measurements, Recurring
Assets
Derivative assets	142	200
Investments and securities	0	0
Total	142	200
Liabilities
Derivative liabilities	39	81
Level 3 | Fair Value, Measurements, Recurring
Assets
Derivative assets	0	0
Investments and securities	46	47
Total	46	47
Liabilities
Derivative liabilities	$ 0	$ 0