Commitments and Contingencies - Schedule of Commitments and Obligations (Details) $ in Millions	Dec. 31, 2018 USD ($)
Purchase obligations
Total	$ 683
Less than 1 year	352
1 to 3 years	266
3 to 5 years	65
More than 5 years	0
Guarantees
Total	59
Less than 1 year	59
1 to 3 years	0
3 to 5 years	0
More than 5 years	0
Letters of credit
Total	770
Less than 1 year	424
1 to 3 years	277
3 to 5 years	65
More than 5 years	4
Letters Of Credit
Letters of credit
Total	28
Less than 1 year	13
1 to 3 years	11
3 to 5 years	0
More than 5 years	$ 4